[GSoC15] Chained Text Boxes - Report Week 11

Hi there,
last week had no real breakthroughs in terms of features.
What went on:

- Submitted code to gerrit for review
- Done a few experiments on undo-ing SetText operations
- Rewritten code for removing overflowing text in terms of
Outliner::QuickDelete instead of the previous (and more cumbersome)
Outliner::SetText.
- Made "domino chaining" 'mostly' working (it does not work in one case).
- Fixed a few bugs on code on chain structure.

There are a few features that are "implemented" but showing misbehavior,
namely:
- the rewriting in terms of QuickDelete has a couple corner cases that
don't work yet.
- "domino chaining" crashes.

Cheers,
Matteo