Clarification of geometry and material documents

Workbench: Project Save for plots

Indirect Data Analysis - Keep open option for Multiple Input

Automatically Add Batch File directory to Directory Manager

Add Emu workflow support part 2 

Update Merlin IDF and IPF

Minor documentation changes

Added LoadSampleEnvironment Algorithm

ConvFitDataPresenter and JumpFitDataPresenter Unit tests

Indirect Data Analysis - Error bars for results

While helping prepare an article, I ended up deriving the equivalence of
delta-d/d = delta-T/T. Since it wasn't a 5-second derivation, it seemed
a good thing to add to the user docs.

This split out the material information into a new concept page, added
additional links between the various docs, and added a big note at the
top of `SetSample` that the dict definitions are in cm.

Make Tooltips Readable on Ubuntu18