Make block title retract/expand collapsible blocks

Patch for "master" branch: https://reviews.mahara.org/3470

Patch for "master" branch: https://reviews.mahara.org/3469

This is a tricky one, because of those blocks with the artefact detail page linked in the block title. We need to make the artefact detail page accessible, because that's where artefact comments and the "report objectionable" link are. But at the same time, making the title a link is no good, because users expect to be able to click on it to expand/collapse the block.

Ultimately, after consulting with Evonne, we decided that the best thing to do would be to move the link to a non-intrusive little magnifying glass icon next to the title. I considered doing this only for collapsible blocks (because the title link doesn't pose a problem for non-collapsible blocks), but that made for an inconsistent and confusing experience. So instead, the magnifying glass is now there for all blocks that have a "title link".

I've pushed a series of commits to implement this.

Reviewed: https://reviews.mahara.org/3469
Committed: http://gitorious.org/mahara/mahara/commit/a91ae60d195a4e1ea9cde60dcf4d02a989ecb2e0
Submitter: Ghada El-Zoghbi (<email address hidden>)
Branch: master

commit a91ae60d195a4e1ea9cde60dcf4d02a989ecb2e0
Author: Aaron Wells <email address hidden>
Date: Thu Jul 3 12:13:30 2014 +1200

Move block detail link to an icon instead of the title

Bug 1337013

Change-Id: I1f0537a4c9a4eff427555751aa3215247ffade28

Reviewed: https://reviews.mahara.org/3470
Committed: http://gitorious.org/mahara/mahara/commit/d3f8be0caa6e4f66f615e0f69dfe6e5d6186e789
Submitter: Ghada El-Zoghbi (<email address hidden>)
Branch: master

commit d3f8be0caa6e4f66f615e0f69dfe6e5d6186e789
Author: Aaron Wells <email address hidden>
Date: Thu Jul 3 12:14:24 2014 +1200

Make block title clickable to collapse/expand blocks

Bug 1337013

Change-Id: Ibb3c54e62830b74e50f3bf02053c47dd2d4123f6