modificacoes locais do bcj e makefile
Merge branch 'master' of https://github.com/michaelsouza/preconditioners
modifications for debugging mxnibf.c can be dismissed
Merge branch 'master' of https://github.com/michaelsouza/preconditioners

Conflicts:
	approx_inverse/src_nbif/mxnbif.c
	approx_inverse/src_nbif/mxnbif.h
modificacoes para uso na maquina 64b