RE 7247_MantidEV_copy_UB_to_MD_workspace

Added method copySample() to MantidEVWorker.  This method
is now called whenever the UB is changed.  That is, it
is called by the "Apply" code for the Find UB, Choose Cell
and Change HKL tabs, which are all of the places that
change the UB.

refs #7247
Merge branch 'feature/7247_MantidEV_copy_UB_to_MD_workspace' into develop