There's no need to reparse something we already got the AST of.

Reviewed-by: Erik Verbruggen

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

Added quickfix operation to split simple-declarations. E.g. int a, b; will be replaced with int a; int b;.

Done-with: ckamm

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

* Rename cursor(unsigned/AST*) to selectToken and selectNode.
  These return a cursor that has the given token or AST node selected.
* Rename getTokenStart/EndPosition to tokenStart/EndPosition.
  Instead of returning line and column numbers, return a position
  usable with text cursors.
* Remove moveAtStart/EndOfToken.

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

Instead, reintroduce setTextCursor and let CPPQuickFixCollector
call it just before invoking apply.

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>