rewrite AddGroupsAction

to get rid of GroupSet
adapt groups.jspf to the rewritten AddGroupsAction
adapt ListRemoveGroupsAction to the rewritten groups.jspf
remove WebSessionSet as it isn't referenced any more
remove WebRhnSet as it isn't referenced any more
remove SelectableWebList as it isn't referenced any more
remove WebList as it isn't referenced any more
Automatic commit of package [spacewalk-java] release [2.3.97-1].
remove unnecessary brackets
Automatic commit of package [spacewalk-utils] release [2.3.19-1].
1024118 - Perl context-help doesn't notice empty help-url strings
Automatic commit of package [spacewalk-web] release [2.3.25-1].
1162311 - cobbler template files need to not have comments
Automatic commit of package [cobbler20] minor release [2.0.11-38].
style /rhn/systems/details/kickstart/SessionStatus page
Automatic commit of package [spacewalk-java] release [2.3.98-1].
1021057 - fixed double-counting systems subscribed to more than one channel
during satellite activation

addresing a situation when activation unsubscribed half of correctly subscribed systems
1021057 - schema upgrade scripts
for changes from previous commit
Automatic commit of package [spacewalk-schema] release [2.3.20-1].
Made text more clear for package profile sync