Several bugfixes for 0.9.12.1 release

[sserita]

This PR has a variety of small bugfixes intended for the 0.9.12.1 release, including:

• Better static DataSet error messages to address #340
• Allow LGST to work with TP-parameterized models for #366
• An optional flag to not include delay operations (and therefore emit canonical QASM2) in QASM conversion for #377
• Better error messages for non-TP gauge transformations for #378
• Removing the spurious file noted in #381
• Fixing a ForwardSim param dimensions tuple bug
• A MarginalizedPOVM basis attribute issue reported internally