[Clipart] Authority Control

[Jonadab the Unsightly One]

I've checked in some further improvements to
clipart-authority-control.pl, and it seems now to be mostly working,
though I do want to test it a bit more, and I need to add an option
for stripping off leading and trailing whitespace from keywords.

I've run it over (a copy of) the 0.9 release, and after some basic
consolidation (such as case folding) it came up with the statistics
below.  (Keywords that only occur once in the whole collection are not
listed.)  I'd like to have a couple of additional sets of eyeballs
besides mine look over this list.  I know there are pairs of keywords
in there that are functionally equivalent and should be combined.

There are some that I already know need to be combined:
bug,bugs
mammal,mammals
bird,birds
animal,animals

Those may be combined already on the list below, as are versions of
keywords that differ only in capitalization.  Plus I also already know
we need to strip leading whitespace.  And I already know we want to
remove the "unsorted" keyword from images that aren't in the unsorted
directory.  But I'm sure there are more on the list than that.  For
example, are "action" and "actions" used in the same sense?  What
about "application" and "apps"?

Here's the whole list:
  598   action
  495   unsorted
  447   icon
  428   lemon_theme_icon
  278   application
  255   computer
  201   icons
  170    flags
  170    signs
  149   improvisedkeywordparse
  120   flags
  118   gradients
  117   signs
  103   europe
   96   hash
   75   america
   68   people
   66   mime-types
   57   animal
   51   food
   51   sign
   50   africa
   47    europe
   46   logo
   45   apps
   45   asia
   44   filesystem
   43    africa
   42   actions
   30   device
   28   ocal
   27   symbol
   27   australia
   26   logotype
   26   images
   26   plant
   26   open clip art logo
   26   filetype
   26    asia
   26   clip art
   22   office
   22   map
   21   map_symbols
   20    carribien
   20   filesystems
   20   fruit
   20   homes
   19   holiday
   19   usa
   19   geography
   18   oceania
   18    south america
   17   canada
   16   xmas
   15   tree
   15   roadsign
   15   coastline
   15   organizations
   15   flower
   14   decoration
   14   entertainment
   14   sports
   13   education
   12   devices
   12   flag
   12    arab
   11   france
   11   germany
   11   states
   11   appicon
   10   tux
   10   spain
   10   bird
   10   christianity
   10   openclipart
   10   historic
    9   tool
    9   thanksgiving
    9   linux
    9   insect
    9   work
    9   park
    9   religion
    8   penguin
    8   baby
    8   fish
    8   trash
    7   music
    7   book
    7   meat
    7   activities
    7   winter
    7   smiley
    7   shape
    7   mammal
    7   shapes
    7   bug
    6   pirates
    6   game
    6   bin
    6   garbage
    6   evergreen
    6   rubish
    6   turkey
    6   united kingdom
    6   building
    6   clean
    6   clipart
    6   flourish
    6   toy
    5   champignon
    5   stop
    5   vegitable
    5   meeting
    5   internationalflag
    5   connector
    5   study
    5   openoffice
    5   otto
    5   automne
    5   callout
    5   mushroom
    4   place
    4   bicycle
    4   puntocero
    4   cute
    4   musicsym
    4   weather
    4   communication
    4   xbill
    4   laptop
    4   bottle
    4   warning
    4   gates
    4   presentation
    4   milk
    4   biohazard
    4   keyboard
    4   candy
    4   imac
    4   traffic
    4   armoiries
    4   boat
    4   belgium
    4   mascot
    4   jza
    4   decorations
    4   bill
    4   wine
    4   microsoft
    4   water
    3   bsd
    3   che
    3   games
    3   pear
    3   clothing
    3   northamerica
    3   wreath
    3   business
    3   logos
    3   eagle
    3   festive
    3   clipboard
    3   fly
    3   chemical
    3   daemon
    3   beverages
    3   library
    3   wildlife
    3   runner
    3   breizh
    3   house
    3   soccer
    3   pig
    3   experiences
    3   meal
    3   ladybug
    3   science
    3   celebrity
    3   boy
    3    historic
    3   flight
    3   architecture
    3   guevara
    3   celtic
    3   handshake
    3   transport
    3   friends
    3   face
    3   race
    3   emblems
    2   grape
    2   bacon
    2   i-80
    2   postage
    2   sell
    2   festival
    2   ocallogos
    2   toys
    2   alexandro
    2   way
    2   usmail
    2   bicycles
    2   mousecursor
    2   un
    2   inside
    2   calebasse
    2   knotwork
    2   scissors
    2   extraordinary
    2   sunset
    2   plane
    2   continent
    2   usb
    2   slides
    2   radioactive
    2   for
    2   chile
    2   sun
    2   farm
    2   cactus
    2   highway
    2   product
    2   great
    2   navigation
    2   curvy
    2   pointing
    2   desert
    2   camel
    2   usholiday
    2   countires
    2   tropical
    2   envelope
    2   u
    2   finger
    2   landscapes
    2   ecus
    2   sale
    2   mail
    2   upc
    2   hopper
    2   scuba
    2   interstate
    2   magnifying
    2   triangle
    2   insects
    2   geometry
    2   foul
    2   technical
    2   man
    2   watch
    2   lantern
    2   star
    2   grass
    2   nimbochromis
    2   maps
    2   venustus
    2   scotland
    2   interface
    2   pen
    2   dive
    2   glass
    2   britain
    2   chicken
    2   code
    2   barcode
    2   arrow
    2   carrot
    2   orange
    2   beverage
    2   bar
    2   street
    2   0x996c42c
    2   no
    2   hand
    2   telephone
    2   moon
    2   template
    2   empty
    2   stamp
    2   table
    2   bouquet
    2   gourami
    2   burner
    2   duck
    2   summer
    2   beach
    2   tank
    2   education_mascot
    2   harvest
    2   tools
    2   turn
    2   garage
    2   houseplant
    2   fruits
    2   gtp
    2   car
    2   one
    2   ball
    2   midautumn
    2   caution
    2   south
    2   vase
    2   water-bottle
    2   money
    2   dry
    2   curve
    2   nations
    2   french
    2   diving
    2   quake
    2   outside
    2   universal