Finish removing M69, which was replaced

Previously M69 was accepted without error, but did nothing.
With this change, it's back to being an unknown-m-code error.
Ignore auto-generated manpages for two new comps
Merge branch 'v2.5_branch' into 2.6

Conflicts:
	docs/man/man9/.gitignore
Add some missing M-codes to the "G-code quick-reference" html docs.
Merge branch '2.6' of ssh://git.linuxcnc.org/git/linuxcnc into 2.6