* drop index and change primary key in DB
* Create schema_update.sql
* Update README.md
* add caching
* fix caching function
* Update schema_update.sql
* removed preload caching
impractical to use, causes crash when building the cache due to the induced lag
* Update README.md
* Create schema_single.sql
converts the dev branch database for use with the rc-1 branch code
* re-add enhanced caching
* Update README.md
* Turned caching off by default
* Update schema_update.sql
* insert version into db if missing
table for cache search fixed