Prune Travis configuration [ci skip]
Now Travis is basically (or entirely?) pay only, at least for our purposes.
Add VSX along with POWER crypto flags [ci skip]
Cheap fix for #2515
apply python path fix only on mingw
otherwise visual studio 2015 will be confused
quote python_exe and script path in makefile
some platforms cannot handle spaces in the python_exe path
Backport some deprecations [ci skip]
These aren't being removed in 3.0 but at least advertise them as being deprecated so new users know to avoid them.
Backport of #2541 increase alignment of lookup tables
Many differences here as some algos are in 2.x but not in 3, and the small tables changes for ARIA/Camellia/DES/SEED were not backported.