More debugging aids around GCPROs.
* lisp.h (struct gcpro) [DEBUG_GCPRO]: Add extra members.
(GCPRO1, GCPRO2, GCPRO3, GCPRO4, GCPRO5, GCPRO6, GCPRO7):
Minor restyle.  If DEBUG_GCPRO, initialize extra fields.
Ignore files and fix indentation of else static if in d-mode
Emacs compiles after porting changes from http://cx4a.org/repo/emacs.bzr/regexp
Add flag compilation-do-echo-command