The epoch field in PKGBUILD files was completely ignored until now,
and the final Version field for a package consisted only of
pkgver and pkgrel (example: 5.0-1)

This means that rpc.php reported the version incorrectly for packages
having epoch > 0.
One case where this was a problem is that it confused AUR helpers
wanting to examine all locally installed packages (with epoch > 0)
and search the AUR for an updated version.

The epoch field is taken into consideration now, and if not 0,
will be prepended to the final Version field (example: 1:5.0-1)

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>