headless build doing something useful

[Riccardo Magliocchetti]

Hello,

with the latest patches i pushed today i'm (finally :) able to compile / 
install / convert some documents with --enable-headless switch.

I've added some documentation to the wiki [1], still in Development 
because it is really not ready for general use i think.

So i would like to thanks all libo developers especially mmeeks, matus 
and tml for their support / help with patches.

thanks,
riccardo

[1] https://wiki.documentfoundation.org/Development/HeadlessBuild