FIX: cppcheck issues + MergeAdjacentImagesTest

FIX: Member variable initializations in constructors.
FIX: Adjusted tolerance for MergeAdjecentImagesTest when
     comparing transformations (Test1-Tfm).
Change-Id: I1623b21b9de14bb3dec70ecb876d1fc073d207f9
Merge topic 'rk-TestFix0'

eb36352 FIX: cppcheck issues + MergeAdjacentImagesTest