util.sqlite3: Fix indentation

mod_storage_sql: Compose a keyval+ store out of keyval and map store methods Removes the need for the shim in storagemanager. The methods only really access the 'store' property of the first (self) argument, so this is safe.

mod_storage_sql: Add UPSERT support Currently limited to SQLite3 for lack of testing on other databases. Adds a migration to replace the non-UNIQUE prosody_index, renaming it prosody_unique_index since ALTER INDEX does not seem to be portable.

tools: Update imports to use new prosody.* namespace

Merge 0.12->trunk

mod_http: Simplify conversion of Set to Array Avoids the _items semi-private value, that is used everywhere for some reason.

mod_http: Fix error if 'access_control_allow_origins' is set Because it changes the type of the 'opt_origins' variable from util.set to the internal _items table so next time an http app is added an error "attempt to call a nil value (method 'empty')" is triggered. The value is not used anywhere else. Noticed when reviewing uses of the '_items' set property. Not reported by any users, implying this setting is rarely used.

util.array: Expose new() on module table For consistency with other utils. Consistency is good.

util.datamanager: Halve size of list index Instead of storing (start, length) tuples, store the offset to the end of items and derive length using the previous entry.

mod_storage_internal: Use a binary search for time based ranges Iterating over an entire archive to find a few items in the far end from where iteration started is expensive, and probably more expensive with the lazy-loading of items added in the previous commit. Since we can now efficiently read items in random order, we can now use a binary search to find a better starting point for iteration.