qml: Added support for attributes in extra
Parse MiniSEED packets for INFO requests.

This enables reading INFO request responses from the IRIS ringserver.

(Previously the MiniSEED payload was simply guessed to start at 8 bytes
offset.)
Fixed use of builtin as variable name.
PEP8
fixes 2038 problem (see #805)
extra test case for #805
reuse TIMESTAMP0 constant
fixes 2038 problem (see #805)
Conflicts:
	obspy/core/tests/test_utcdatetime.py
	obspy/core/utcdatetime.py
extra test case for #805
reuse TIMESTAMP0 constant
changelog
Merge branch 'releases'

Conflicts:
	CHANGELOG.txt
	obspy/core/utcdatetime.py
Added unittest for different MiniSEED packets.
Added correct ticket number.
__ne__() for Catalog objects.
Python 3 compatibility
Flake8

(Sorry.)
Merge pull request #807 from bmorg/fix_seedlink_miniseed_parsing

Use clibmseed to parse INFO responses in MiniSEED
minor docstring fix (see #808)
Use faster pcolormesh for plotting PPSD.