[FIX] Ungrouping (all) columns now works as expected

The Table did not reset the numberOfExpandedLevels before removing the
grouping.

- Introduced 2 API functions to the TreeBindingAdapter for setting the
numberOfExpandedLevels.
- Added the reset mechanism to the AnalyticalTable

Change-Id: Ic19a734d904768e9cc442098373d000355a7d0cb
(cherry picked from commit 15f43ba90883ae7fe144ea444ce51518f77f1b94)
CR-Id: 012003146900009114872014
Merge "[FIX] Ungrouping (all) columns now works as expected" into rel-1.26