The `disableIndentCorrections` setting now only disables the (aggressive) indent corrections that TextMate does while you type.
There is an additional `indentOnPaste` which you can set to:
1. `simple` — this is the indent behavior which was previously implied when setting `disableIndentCorrections`. It indents the paste to the position of the caret and works well for Python.
2. `disable` — the text is inserted as-is without indenting it.
3. «unset» — indent the paste based on the indent patterns of the current scope.
This turned out to be a little more involved due to how we need to make a distinction between a forward delete (prepend) and backward delete (append).
Implements issue #118.
