[KPhotoAlbum] KPA "shadow DB" utility ready

[Tim McCormack]

TL;DR: Here's a utility to manage persistent unique image IDs for KPA
photos.

I've been rewriting my web gallery generator, and the
first portion is done: A utility to maintain a separate SQLite database
that assigns permanent, unique IDs to photos in a KPhotoAlbum index.xml
file. If all goes well, every time KPA detects a moved or edited file,
when the shadow DB is updated it will follow these changes. The
shadower's full function is to present an easy-to-handle copy of the
KPA db, but the core feature is the imageID/md5/path table.

Here's the codebase at v0.2.0:

https://github.com/timmc/kpawebgen/tree/v0.2.0/

As of now, only the shadower (the "read" action) is implemented.

 - Tim McCormack