Lists the eclasses used by every ebuild.
Not including packages which don't inherit anything. Also not included are eclasses inherited by other eclasses.

Data Format ( 7|dev-libs/foo|foo-1.12-r2.ebuild|eutils:elisp|dev@gentoo.org:loper@foo.de ):
7                                           EAPI Version
dev-libs/foo                                package category/name
foo-1.12-r2.ebuild                          full filename
eutils:elisp                                eclasses which the ebuild inherit (implicit inherit not included)
dev@gentoo.org:loper@foo.de                 maintainer(s), seperated by ':'