Dazl

* Fix pingpong startup instructions.
* Allow for a configurable maximum record time (only takes effect for DAML SDK versions _before_ 1.0).

Fix a bug that caused ready() calls to perpetually hang if a connection was initially opened, but dropped before the ACS could fully be read.

There are minor breaking changes to some usages of `network.aio_run()`; if you do not call this method directly, it should be safe to upgrade; otherwise, there is a minor adjustment that you will need to make to your code:

py
network.aio_run(RunState(RunLevel.RUN_UNTIL_IDLE))


becomes

py
network.aio_run(keep_open=False)

This is primarily a bug fix release.

* Fix a problem in using Numeric types when submitting commands.
* Expose the return value of a choice in exercise events.

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.