Assume that setuptools are required if the traditional Python build/install

Added macro python_version_nodots for retrieving python version

Fix bug when file may be skipped during 'provides' and 'requires' calculations

build-python3.)
.prov.py: generalize to generate longer provs, too.
%python_req_nohier added, the reverse to %python_req_hier
Print a bit more diagnostics for ignored/skipped/hidden autoreqs.

%python{,_build}_install: force deterministic behavior (useful in
compileall.py: depth-first processing (like in rpm-build-python3).

implemented %requires_python_ABI, which ultimately asks verify_elf

python.compileall.py: remove unused variable.

Unpackaged tools subpackage.

python.prov.files: assume that all python extensions are located

python.compileall.py:
python.{prov,req}.files:
python.{prov,req}.py: removed is_python3 check.
brp-bytecompile_python:

python.{prov,req}.files: reintroduced optimization from 0.36.0-alt3.
python.prov.files: skip all files that cannot be provided due to

Take %_python3_path into account

Require python-base >= 2.7.2-alt3 (with subprocess module)

Simplify automatic dependencies to python-base and python-modules
Skip processing python3 scripts and %_libdir/python3 stuff