Dpkg::Source::Patch gains last features from dpkg-source

Dpkg::Source::Patch gains last features from dpkg-source

* scripts/Dpkg/Source/Patch.pm: New analyze() function that
replaces dpkg-source's checkdiff(). Check sanity of patch,
and reports directories to create and list of patched files.
* scripts/Dpkg/Source/Patch.pm (apply): Create required
directories on the fly and adjust timestamp of patched
files. This behaviour is configurable.
* scripts/dpkg-source.pl: Adjust accordingly.
* scripts/Dpkg/Source/Patch.pm (add_diff_file): Support
new option include_timestamp.