Refs #10218.  Made change to gsas data format.

On branch feature/10218_gsas_vulcan_format
Changes to be committed:

      modified:   ../Mantid/Framework/PythonInterface/plugins/algorithms/SaveVulcanGSS.py
Fixed doc test. Refs #10218.

On branch feature/10218_gsas_vulcan_format
Changes to be committed:

      modified:   Mantid/docs/source/algorithms/SaveVulcanGSS-v1.rst
Refs #10247. Fixed initialization of PoldiPeakCollection members
Refs #10247. Added PoldiCreatePeaksFromCell algorithm
Added unit tests, documentation for PoldiCreatePeaksFromCell

Refs #10247.
Refs #10247. Corrected summary in PoldiCreatePeaksFromCell
Refs #10247. Fixed property names convention problem.
Refs #10247. Fixed property names in usage example
Refs #10247. PoldiPeakCollection can now store a point group

If a PoldiPeakCollection is created from a CrystalStructure, it can be useful to at remember at least the point group from which it has been created.
Checkpointing work on PoldiIndexKnownCompounds.

Refs #10247.
Refs #10247. Added unit tests, small refactoring
Refs #10247. More unit tests
Refs #10247. Cleaning up, documentation
Remove tcmalloc from list of globally linked libraries.

It will become a library loaded through LD_PRELOAD so we keep the search
for it but move tcmalloc_minimal to be found first if it exists.
Refs #10271
Refs #10247. Tolerance is absolute, not relative.
Refs #10247. Started wiki page for PoldiIndexKnownCompounds
Simplify to process of loading the Python plugins on Linux.

Remove any need to force some libraries to load first. Newer linkers
seem to have removed the need for this.
Refs #10271
Fix library link order for older linkers.

stdc++ is required to be linked first to avoid a segfault when
exceptions are thrown and pass into the Python layer.

Refs #10271
Refs #10247. Changed score calculation, tolerance relative again.
Refs #10247. Copying parameters from measured peaks.