Clean up libalpm/add.c and revise file extraction code

This is a full refactoring of _alpm_add_commit into multiple functions and a
better layout for later. Some highlights:

* No regressions in pactest performance.
* Much cleaner layout. add_commit is split into four functions:
  upgrade_remove, extract_single_file, commit_single_pkg, _alpm_add_commit
* No more super-functions, the heaviest (extract_single_file) is finally
  under 400 lines, with much improved commenting as well.
* Incorporation of Andrew Fyfe's ideas for fixing FS #7484. Try to handle
  all possible cases of extraction combinations with files, symlinks, dirs,
  and non-existant entries on the filesystem. This should make our dealings
  with libarchive fall more into our control.

Signed-off-by: Dan McGee <dan@archlinux.org>

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