Add failing test for patchlevel version comparisons
depends_on :python sets PYTHONPATH internally

This applies only to non-brewed python:
The user will still have to set his PYTHONPATH
in order to import python modules in an
external python interpreter. However, a
warning will be displayed, now.

Further, during the build, the PYTHONPATH
will be set to Homebrew's global site-packages
so that software (like PyQt and others) that
need to `import sipconfig` in python can
find the brewed sip and its python module.
MacVim: Link python statically
Consolidate formula visibility blocks

Closes #20261.
rabbitmq-c: options come before deps
Improve tokenization of version strings

Tokens like "b4", "beta1", "p195", &c. are now treated as atoms rather
than being broken down even further. Additionally, we enable support for
padding in the middle of versions strings, so we can successfully
compare something like "2.1-p195" with "2.1.0-p194" by inferring that
"2.1" is really "2.1.0".

This fixes the comparison "9.9.3-P1" > "9.9.3" which previously has not
been handled correctly.
omniorb: remove variable
Define to_s for Version::Token