note about qommon, so that people know where to get it

git-svn-id: svn://localhost/lasso-conform/trunk@12 2a3a78c3-912c-0410-af21-e1fb2d1df599

lcs/__init__.py

@@ -2,7 +2,13 @@ import sys
 import os
 sys.path.insert(0, os.path.dirname(__file__))
 
-import qommon
+try:
+    import qommon
+except ImportError:
+    print >> sys.stderr, 'Failed to import module \'qommon\''
+    print >> sys.stderr, '  export CVSROOT=... (for w.c.s., see labs)'
+    print >> sys.stderr, '  cvs checkout -d lcs/qommon wcs/wcs/qommon'
+    sys.exit(1)
 
 import lasso
 if not hasattr(lasso, 'SAML2_SUPPORT'):