Made the scanners generated by gelex compilable in void-safe mode with ISE 7.3.
File .gitignore added.
Value of gc_lib in file tool/gec/confic/c/gcc.cfg changed to "-lgc"
(the library may reside in a directory different from $BOEHN_GC/lib).
Revert "Fixed bug in gelint when processing Eiffel for .NET systems."

This reverts commit 0ab8d69b8d9715e7eda07422ff5f0ce36bb6a3a5.
Some minor bugs of the debugger fixed and layout improved.
Update from master

Conflicts:
	.gitignore
Merge branch 'extra' of https://github.com/wjansen/GOBO-Eiffel-debugger into extra

Conflicts:
	library/tools/debugger/dg.c
	library/tools/debugger/dg_generator.e
	tool/gedb/driver.vala