[PYOPENS] setup.py as minimal as possible

    moved codegeneration and moving of files needed for
    pyopenms distribution to new file create_cpp_extension.py

    setup.py is now as minimal as possible, which provides errors when
    using pip and its dependency resolution mechanism.
[PYOPENMS] only one build target for pyopenms

    building files for distribution + building extension "in place"
    in one step. this is faster than seperate builds, as the
    c++ compiler and linker are only called once
[PYOPENMS] refactored build targets for pyopenms
[PYOPENMS, CLEANUP] reformatted pyopenms.cmake
[PYOPENMS, FIX] fixed dependency decl in pyopenms.cmake
[PYOPENMS] new strategy for naming pyopenms distributions

    + the name now combines open-ms version + timestamp of built
      of pyopenms.
      (this helps avoiding mistakes with intermediate versions of
      pyopenms)

    + minor cleanup

Conflicts:

	pyOpenMS/setup.py
[PYOPENMS,FIX] fixed regression from last commit e334d31
[PYOPENMS,CMAKE] running cmake removes pyOpenMS/build/ dir if exists

    When working on pyopenms existing shared libraries in pyOpenMS/build
    might be out of date, but the linker prefers these and possibly
    complains about "undefined symbols".
    This commit adapts pyopenms.cmake such that running "cmake" this
    build/ is removed in the OpenMS build tree if it exists.
[PYOPENMS,CMAKE] extended last commit 4d92e6
Merge pull request #677 from uweschmitt/pyopenms_cleaner_build

[PYOPENMS] setup.py as minimal as possible + other improvements