Dazl

This is primarily a bug fix release.

* Make dazl version return the proper string instead of "unknown".
* Fix a problem in matching where a query on a record with a different set of keys than the target object returns true instead of false as it should.
* Fix a problem where DALFs with no dependencies or dependents were incorrectly never being read. This is mostly a cosmetic problem introduced by recent versions of the DAML SDK, but if a DALF with a template and no dependencies was somehow constructed (currently not possible in any version of the DAML SDK), those templates would have been ignored instead of being processed.

Remove a spurious warning on reading DARs compiled with `nat` (versions of the DAML SDK >= 0.13.38). Fixes 64.

Support for DAML-LF Dev in SDK 0.13.40.

Switch to using the ACS service by default instead of reading events from the transaction stream.

Fixed a regression introduced in 6.5.0 that prevented parsing of DARs from versions 0.13.0, 0.13.10, 0.13.12, and 0.13.15 of the DAML SDK.

Support for DAML-LF 1.7 (SDK 0.13.37 and later).

Support for parsing daml-lf-dev SDK 0.13.37 has also been added, but support for new functionality in the dev versions of DAML-LF are not yet implemented.