onec 1.3.1
Mostly related to documentation and build system:
- added a new modeling manual, moved some content from programming manual to that
- minor changes to some of the subfolder names
- modified the release CI system to include documentation, headers and examples
- modified makefile to include install, which installs the documentation and example files
- updated the Homebrew formula to install the man, docs and examples to the right places
- added support for EX6, which I thought we had done earlier but never implemented
- minor fix to silence a warning about compat_time on non-Windows machines