Fix for OCSIGENGROUP groups with spaces in the name

[mmorga]

This addresses issue #101

For each impacted Makefile, references to $(OCSIGENGROUP) have been replaced with “$(OCSIGENGROUP)”.

[vouillon]

Can you really have a whitespace in a group name?

On my machine, man groupadd indicates:

       On Debian, the only constraints are that groupnames must neither start
       with a dash ('-') nor plus ('+') nor tilde ('~') nor contain a colon
       (':'), a comma (','), or a whitespace (space:' ', end of line: '\n',
       tabulation: '\t', etc.).

[vasilisp]

That does look weird. Are we talking about Cygwin or one of the other Unix-on-Windows layers?

In any case, the fix looks harmless, so we can merge it. Style-wise, I think we should push the quotes outside the whole string, e.g., "$(OCSIGENUSER):$(OCSIGENGROUP)". Maybe also apply the fix to all occurrences of $(OCSIGENUSER)? Why would the rules for user names be any more restrictive?