new tex2lyx version

[Uwe Stöhr]

Some time ago I started to overhaul tex2lyx to be able to create a version that will support the 
fileformat of LyX 1.6.0.

I added support for lots of commands and updated existing support to the current actual trunk 
fileformat:
http://www.lyx.org/trac/changeset/21813
Please test.
More updates will follow.

regards Uwe