debuginfo-install: clearly separate source and debug package names
debuginfo-install: remove dead code uncovered by variable renaming
debuginfo-install: Make laywers happier by assigning copyright to Red Hat
debuginfo-install: fix handling of subpackages with non-zero epoch
debuginfo-install: support cases where src.rpm name != binary package name

E.g. source package "krb5" does not generate binary package named "krb5".

Side-effect is that dependency processing algorithm was slightly
changed. I hope that now it is more accurate.

E.g. glibc dependency on "libfreebl3.so()(64bit)" now pulls in only
dependency tree from "nss-softokn-freebl" sub-package but not from its
main package "nss-softokn".