MYSTRAN 17.0.0

This update has been in the works for a while, and several new features have been introduced.

Among the additions, the most relevant are the MITC shell and the QUAD8 element -- both courtesy of @victorkemp.

There have also been bug fixes and performance improvements.

For details, check out the list of pull requests below, or the commit-level diff between 16.0.0 and 17.0.0 if you prefer.

Pull requests

Changed default AUTOSPC NSET from 3 to 1 by @victorkemp in #132
shell differential stiffness implemented but a few loose ends by @victorkemp in #127
Better counters, better build script, SuperLU update by @Bruno02468 in #131
fixed rotated coordinate system bug by @victorkemp in #133
Condition to skip K6ROT code if 0 to avoid crash by @victorkemp in #134
Changed ALPVEC use for solid, membrane, composite by @victorkemp in #137
Composite buckling by @victorkemp in #139
Bailout fixes by @victorkemp in #140
Mitc8 basic stiffness by @victorkemp in #144
Mitc8 with stress/strain/force output by @victorkemp in #147
MITC4/MITC4+ basic stiffness by @victorkemp in #149
MITC4+ more features by @victorkemp in #153
included -1/t^2 factor in MID4 output by @victorkemp in #154
MITC4+ gravity and eigenvalue by @victorkemp in #155
Updated release_notes.md in preparation for 16.0.0 release by @zchlrnr in #157
Fatal error is PSHELL's MID4 is not 0 or blank by @victorkemp in #159
Pre-v17 memory bug fixes by @Bruno02468 in #160
Prevents crash but not sure if OP2 is correct by @victorkemp in #163
Fix MITC4+ corner stress bug by @victorkemp in #168
Fix missing default SIGMA and set to -1.0 by @victorkemp in #169
Removed DEF EXT from INI file and made bdf and dat both defaults. by @victorkemp in #171
Getting rid of fort.N files and the many issues they cause by @Bruno02468 in #174