qcscine/database: Release 1.2.0

Changes: getAggregate per default recursively looks up the original structure in case the method calling Structure instance is a duplicate. This avoids adding duplicates to aggregates. The methods related to duplicates were renamed, the old method calls are now deprecated. Increase pickle support of Python bindings. Corrected the 1.0.0 to 1.1.0 update script. Corrected case sensitivity in model completion. Corrected temperature setting completion for none case