[REVIEW] fdo#48969 ODF import measure conversion regression

[Michael Stahl]

this is a funny regression in 3.5, the unit parameters to the
unit conversion function were switched, so it went in the wrong
direction, resulting in tiny font sizes when opening ODF documents
produced my MSOffice (they apparently use some obscure "inch" unit that
needs converting).

the buggy conversion function sax::Converter::convertDouble was buggy
since it was added many years ago, but it was also unused, until
i cleaned up some code duplication and removed its duplicate
(which did it correctly) with commit
3ca2bef76886450058d1667703aeafe4c2e456c3

proposed fix for libreoffice-3-5:

http://cgit.freedesktop.org/libreoffice/core/commit/?id=84aeb737c7c013c8d98d8c40abfca44f6f70cee8

for good measure (?) i've implemented various additional conversions as
well, no idea why they were unimplemented before:

http://cgit.freedesktop.org/libreoffice/core/commit/?id=62a0b2405798a3be6a4e38652f1da7a685c84bfc

to prevent future calamities of that nature i've added a unit test:

http://cgit.freedesktop.org/libreoffice/core/commit/?id=ee376102becc16c0c44d23e5eb2a322aadc45197

also, apologies to Radek who i've suspected to be the culprit but upon
closer examination he is innocent :)