Pymux

New features:
- Added 'C-b PPage' key binding (like tmux).
- Many performance improvements in the vt100 parser.

Improvements/fixes:
- Don't crash when decoding utf-8 input fails. (Sometimes it happens when using
the mouse in lxterminal.)
- Cleanup CLI object when the client was detached. (The server would become
very slow if the CLI was not removed for a couple of times.)
- Replace errors when decoding utf-8 input.
- Fixes regarding multiwidth characters.
- Bugfix: Don't use 'del' on a defaultdict, but use pop(..., None) instead, in
order to avoid key errors.
- Handle decomposed unicode characters correctly.
- Bugfix regarding the handling of 'clear'.
- Fixes a bug where the cursor stays at the top.
- Fix: The socket in the pymux client should be blocking.

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Fixes:
- Fixed bug in remove_reader (ValueError).
- Pin Pyte requirements belowe 0.6.0.

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New features:
- Added status-interval option.
- Support for ANSI colors only.
* Added --ansicolor option.
* Check PROMPT_TOOLKIT_ANSI_COLORS_ONLY environment variable.
- Added pane-status option for hiding the pane status bar.
(Disabled by default.)
- Expose shift+arrow keys for key bindings.

Performance improvements:
- Only do datetime formatting if the string actually contains a '%'
character.

Fixes:
- Catch OSError in os.tcgetpgrp.
- Clean up sockets, also in case of a crash.
- Fix in process.py: don't call remove_reader when master is None.

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Fixes:
- Prompt_toolkit 1.0.4 compatibilty.
- Python 2.6 compatibility.