replaced all alias > folding thresholds in include/galsim/*.h and src/*.cpp
(#562)
modified GSParams folding threshold at wrapper level
(#562)
updated alias > folding threshold in demo7 in example scripts
(#562)
updated to folding threshold for lsst.yaml demo script
(#562)
made fold / alias switch at python layer
(#562)
Allow alias_threshold as valid obsolete alias for folding_threshold.
(#562)
Change test suite back to using alias_threshold to make sure backward compatibility is working.
(#562)
Tidy up slightly.  Move the new code down to where the other GSParams code is in base.py.
(#562)
Merge branch 'master' into #562
silly spacing issue
(#562)
Merge branch 'master' into #562
updated changelog
(#562)
fix spacing and aliasing use
(#562)
fixed references to aliasing that remained in docstring for folding_threshold GSParams
(#562)
Merge branch 'master' into #562
Merge pull request #568 from GalSim-developers/#562

#562 - Replaced GSParams alias_threshold with folding_threshold