find_identical_books()
API coverage is now 100%
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Implement saved searches API
Migrate the rest of calibre to use the new saved searches API
Merge branch 'kovidgoyal/master'
Refactor saved search API to make it thread safe
Strip spaces off of function names before looking them up. They shouldn't ever be significant.
Implement enforcement of unique custom template function names.
Merge branch 'kovidgoyal/master'
Merge branch 'master' of https://github.com/cbhaley/calibre

Enforce global uniqueness across libraries for user defined template
function names, this will allow the sue of multiple libraries in the
same process.
Add loading of user template functions to the new backend
Fix problems creating template functions caused by the changes for the new single-name rule
Merge branch 'kovidgoyal/master'
Merge pull request #42 from cbhaley/master

Fix problems creating template functions caused by the changes for the new single-name rule
Allow using a tweak to switch db backends
Use the correct metadata backup implementation
Missing legacy API
Replace use of db.conn.close() as it is not supported in the new backend
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