querypath 6.x-1.3

This release adds QP Cache support.

QP Cache is a cache system optimized for XML storage with arbitrary keys (objects, strings, whatever). Cache lookups are very fast, and cache maintenance is left to the implementor. (In other words, Drupal cache clears have no impact on this cache -- by design). The main use case, it is anticipated, is to store local copies of documents retrieved from a remote service.