Merge pull request #2 from rampage644/master

Build process + fixed issue#1
Merge pull request #3 from rampage644/master

Testing suite
Merge pull request #4 from rampage644/dev

Testing script
added "release" build option to main build script

now running ./2build_zpython.sh release
will build python.tar in release mode:
- no debug build options
- main binary will be stripped
Merge pull request #5 from pkit/build_fixes

added "release" build option to main build script
split PREFIX into PREFIX and DESTDIR

using a `PREFIX` that is relative to checkout tree is unwise as `PYTHONPATH` and `PYTHONHOME` will point there after compilation
all relative stuff was moved to `DESTDIR` and `PREFIX=/` now, because this where we mount our `python.tar` when executing it
Merge pull request #7 from pkit/minor_fixes

split PREFIX into PREFIX and DESTDIR
Added `_ctypes` module to built-in's.