Update to 0.2.

Nearly a complete rewrite in order to deal with the following situation:
a package's Makefile include a Makefile fragment (like a buildlink.mk file)
which does not exist, so `$MAKE show-depends-dirs' cannot be run. To resolve
this pkgcvsupdate now try to figure out which package provide the missing file
and update it first (and its dependencies), it will update a second time
the crippled package in case the fragment - hopefully now in place - brings
along new dependencies.

Thanks to zuntum for this interesting case I overlooked!

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