This script searches if there is a newer revision (-rX) available. In case a newer revision is found KEYWORDS are
gonna be checked as well. If both keywords are the same for both ebuilds the older one is considered as a removal
candidate.

Data Format ( 6|01865|01311|6|00649|-----|+|dev-libs/foo|foo-1.12-r1|foo-1.12-r2|dev@gentoo.org:loper@foo.de ):
6|01865|01311|                              EAPI Version (older) | days since created | days since last modified
6|00649|-----|                              EAPI Version (newer) | days since created | days since last modified
+                                           indicates if bugs are open to this package (+=yes, -=no)
dev-libs/foo                                package category/name
foo-1.12-r1.ebuild                          full filename (older)
foo-1.12-r2.ebuild                          full filename (newer)
dev@gentoo.org:loper@foo.de                 maintainer(s), seperated by ':'