Removed Singleton behavior from FunctionalTestFactory; now it is just a registry which is populated in main() of App

Number of lines of code modified to have constant time bin size; fix in qmake to avoid compilation failure in the case of absent ROOT

Python functionality partly restored, but rotation tests isgisaxs07 and mesocrystal1 are crashing in python

  a result; ideally it should not at all change the internal state;
  definitely it should not store the result.
Comments, layout.

This reverts commit e202d1ef.