Fix issue #202 - crash due to sqlite parameter limit being hit.

NOTE: Queuing here for merge after next stable.

The queries which have the potential to cause crashes due to too many parameters in the ApkProvider are now encapsulated in ApkProvider and can only be accessed by safe helper methods, which alleviate the problem by breaking big requests down into many smaller requests.

This will probably have to be done for the ApkProvider, but leaving for now because the limit is twice as big.