Updated code_conventions.txt.
Update code_conventions.txt.
Replace unsigned long with ulong in code_conventions.txt.
Added mp_limb_signed_t to code_conventions.txt.
Merge remote-tracking branch 'fredrik/trunk' into trunk
fixed headers for replacements of long -> len_t
updated replace_longs script for removing typo that forgot documentation
Merge remote-tracking branch 'fredrik/trunk' into trunk
Merge remote-tracking branch 'andres/mingw' into trunk

Conflicts:
	arith/doc/arith.txt
	fmpq_mat/doc/fmpq_mat.txt
	fmpz_mat/doc/fmpz_mat.txt
Replace unsigned long with ulong throughout.
Attempt to switch all longs to slong.
Fix minor bug in profiler.h to do with slong.
Fixed problem with profiler.o.
Switched all len_t to slong.
Update code_conventions.txt
Added missing test file.