Remove python 2 __future__ Imports and Imports of six

Fix Colour Bar Scales on Ragged Workspaces

Improve tooltips on the reflectometry GUI

inplace specialization for SetUncertainties

Remove completed Algorithms from AlgorithmManager managed algorithms

a new report for scraping the git log

Add check to handle delete observer

Remove Bash 4.2 feature breaking Mac OSX

The tests include a check for the line numbers that an error occurs
on. The removal of the import future has reduced these values by 2.

Accidentally removed inheritance of systemtesting.MantidSystemTest when
removing with_metaclass and add_metaclass. Put them back.