cleanup / consistency fixes for the fmpq module
cleanup / fix consistency for the fmpz_mat module
cleanup / fix consistency for fmpq_mat
cleanup / fix consistency in arith module
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