* ExceptionMessage: new exception based message for errors and warnings.
* package.C.in:
- replace lyxerr based errors and warning with ExceptionMessage throwing.
- bail_out(): erased!
* os_win32.C:
- replace lyxerr based errors and warning with ExceptionMessage throwing.
- bail_out(): erased!
* tex2lyx.C: catch any exception from Package class.
* lyx_main.C: catch any exception from Package class and act accordingly.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@16834 a592a061-630c-0410-9148-cb99ea01b6c8