(big-config) the new "big-config" for large setups

If you have many thousands of repos and users, neatly organised into
groups, etc., the normal gitolite fails.  (It actually runs out of
memory very fast while doing the "compile" when you push the config, due
to the number of combinations of repo/user being stored in the hash!)

This commit series will stop doing that if you set $GL_BIG_CONFIG = 1 in
the rc file.

Some notes:

  - deny rules will still work but somewhat differently -- now they must
    be placed all together in one place to work like before.  Ask me for
    details if you need to know before I get done with the docs

  - I've tested most of the important features, but not every single
    nuance

  - the update hook may be a tad less efficient now; we can try and
    tweak it later if needed but it shouldn't really hurt anything
    significantly even now

  - docs have not been written yet

src/gl-auth-command

@@ -28,6 +28,7 @@ our ($GL_LOGT, $GL_CONF_COMPILED, $REPO_BASE, $GIT_PATH, $REPO_UMASK, $GL_ADMIND
 # and these are set by gitolite.pm
 our ($R_COMMANDS, $W_COMMANDS, $REPONAME_PATT, $REPOPATT_PATT);
 our %repos;
+our %groups;
 
 # the common setup module is in the same directory as this running program is
 my $bindir = $0;
@@ -55,6 +56,10 @@ my $repo_base_abs = $ENV{GL_REPO_BASE_ABS} = ( $REPO_BASE =~ m(^/) ? $REPO_BASE
 #       start...
 # ----------------------------------------------------------------------------
 
+# no arguments given?  default user is $USER (fedorahosted works like this,
+# and it is harmless for others)
+@ARGV = ($ENV{USER}) unless @ARGV;
+
 # if the first argument is a "-s", this user is allowed to get a shell using
 # this key
 my $shell_allowed = 0;
@@ -184,7 +189,7 @@ $ENV{GL_REPO}=$repo;
 #       first level permissions check
 # ----------------------------------------------------------------------------
 
-my ($perm, $creator) = &repo_rights($repo);
+my ($perm, $creator, $wild) = &repo_rights($repo);
 if ($perm =~ /C/) {
     # it was missing, and you have create perms
     wrap_chdir("$repo_base_abs");