* Add two helper macros to the PKGBUILD templates. apply_patch_with_msg applies a patch ensuring a backup is made and with an output message showing the patch being applied to help with debugging. del_file_exists delets files and is meant for where a patch creates new files. Those added files may not be deleted if the PKGBUILD is reran causing patch to fail saying it's already been applied.
Fix the setup-py template to use a _dtoken variable for part of the URL in pypi. Those use a download token for each software package and is unique to EVERY version. Also, use python${pver}-build-${CARCH} consistantly. The CARCH allows us to have for binary versions so that they could be examined if a build problem were to occur and speed up the build.
* Fixed the comment about the source and made a point about downloading from some source such as github instead of pypi.
* mingw-w64-python-more-itertools - 4.2.0, mingw-w64-python-pytest - 3.5.1 - Update to the latest.
