[xwiki-devs] [Summary] Delete Core, Web, Panels and XE 1.1 branches

Now that we've started creating the branch for 1.3 I'd like to remove the 1.1 branches for Core, Web, Panels and XE. Rationale: * Cleanliness * Having opened branches can tempt committers to commit stuff to the branch. Closing it clearly shows that we don't intend to work on it anymore * We still have the latest released 1.1.x versions, so if there's an urgent need to release a 1.1.3 version we can still do it. * This will allow us to remove the 1.1.3 version in JIRA thus keeping it clean too and again preventing people from using it. * We can't work/support too many branches at once, that's just too much work * We want people to upgrade to newer versions. * XE 1.2 was released quite some time ago and is stable. 1.3 is about to be released as final too.