(One of) the problems with F-Droid's multiple support is that there is
a primary key on the fdroid_apk table which is a composite of:
* id
* vercode
Which means that two repos providing the same version means one will
update the other, rather than ending up with two different versions.
Instead, there should be some other way to differentiate apks from
different sources. Firstly, it should take into account the signing
cert. Secondly, it may taken into account the hash, because two people
could sign different apks with the same cert and then we are back at
square one.
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