Fix for bug #1726 -- use a Tunable to ask for group name

Change-Id: I03ef42b695cd2e01dd41d673dca445e46ca901d3
Remove debug line...

Change-Id: I2e5921f24ecaea0422c950ec3781eead50819e36
Merge branch 'develop' of git+ssh://github.com/cytoscape/cytoscape-impl into develop