In packages_all_$suite, store only description Id, not full description, nor

In packages_all_$suite, store only description Id, not full description, nor
repeat those fields that are already in the index. *do* add fields that are
not normally available, such as the section & subsection one, and always a
'source' one without version, that always exists and points to the source.

Drop maintainer too, that info should be gotten from source package, which has
co-maintainers too