import('python').find_installation('python').version() causes exception
because of a missing initialization, when `find_installation()` receives
a name or a path.
D lang compilers have an option -release (or similar) which turns off
asserts, contracts, and other runtime type checking. This patch wires
that up to the b_ndebug flag.
Fixes#7082
This doesn't touch everything as it's just based on the python3 module
tests, ported to the python module. It's still better than the one very
basic test in the unit test module.
Charles Brunet
Filipe Laíns
Michael Hirsch
Dylan Baker