What's new since Babeltrace 2.0.2?

This release contains a number of fixes, but more importantly an
initial documentation for the Python bindings.

The full change log follows.

2020-04-24 Babeltrace 2.0.3 (German Beer Day)

Fix: lib: use appropriate format specifier to print message iterator class
Fix: sink.text.pretty: check that port is connected before creating message iterator
Add initial Python bindings documentation
Fix: bt2: read properties on _DiscardedEventsMessage
tests: add tests for discarded events/packets creation
Fix: bt2: add precond. check, for stream class supporting discarded msgs with clock snapshot without clock class
Fix: flt-utils.muxer: reference leak in muxer_msg_iter_add_upstream_msg_iter error path
Fix: sink.text.details: goto error when failing to add input port
Fix: src.text.dmesg: add missing assignment of status on error path
Revert "bt2: _EventConst.getitem(): use a single temporary variable"
Fix: src.ctf.fs: initialize the other_entry variable
bt2: _EventConst.getitem(): use a single temporary variable
Fix: _EventConst.getitem(): check if event has a packet
doc: bt_field_class...get_mapping_labels...(): clarify RV's validity
doc/api/libbabeltrace2/style.css: make font weight of .intertd normal
Update working version to Babeltrace 2.0.3

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