TiLP on Mac OS X

Some will notice that a tilp-osx directory has appeared in the CVS tree.

This is the early beginning of the OS X port. The GUI is mostly finished, as well as classes definitions.

I expect a fully functionnal version of TiLP before the end of the year... if real life does not catch me up :)

Things that needs to be done :
- hook the GUI to the core
- code the preferences management
- code the DnD stuff
- code the driver for the TIGL USB (possibly in the libticables using the IOKit)
- code the support for the driver into the libticables

Please do not hack on this code.

-- JB.