Modifies storeAIP.py to calculate the size of uncompressed packages.

Checks if package is a file or a directory. If it's a directory, the size is calculated by walking through the sub-directories. No change is made to how the size is calculated for compressed AIPs. This code is based on the code in moveToBacklog.py for calculating the size of transfers sent to the backlog.

This should fix issue #7175.