Added a 'default' group definition to test cases which should normally run,
leaving out the openIssues group. This makes it easier to selectively run in
NetBeans, which gives you a set of checkboxes of what to include rather than
allowing you to exclude groups.
Added 'openIssues' to the default excludes in the phpunit.xml and build.xml.
HOWEVER, the exclude is not picked up by phing as per
[phing ticket #1159](http://www.phing.info/trac/ticket/1159#ticket), so
the excluded tests always run and always fail.
Added default group to all test cases to make it easier to run test suite
inside NetBeans while excluding openIssues group.