Add a set of macros to further automate spec %prep tasks

- This adds two main macros (+ bunch of helpers) to automate the
  common case tasks in %prep:
  1) %autopatch which automatically applies all patches from a spec
  2) %autosetup which (optionally) takes care of it all, and (also
     optionally) sets up a git/hg repository of the unpacked source +
     applied patches as it  goes.
- This should be considered a starting point only, there are various
  things to improve. Eg we'd like to be able to make backups
  with plain patch (based on patch number maybe) and at least with git,
  we'd like to be able be (optionally) use 'git am' patching style
  to preserve original authors + commit messages etc.
- A noteworthy point here is that as these are fully implemented as
  macros, they are compatible with several older rpm versions as well.

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