* Major changes to build infrastructure: cleanup of makefiles and addition
of a configure script.
* monitor-content window option to monitor a window for a specific fnmatch(3)
pattern. The find-window command also now accepts fnmatch(3) patterns.
* previous-layout and select-layout commands, and a main-horizontal layout.
* Recreate the server socket on SIGUSR1.
* clear-history command.
* Use ACS line drawing characters for pane separator lines.
* UTF-8 improvements, and code to detect UTF-8 support by looking at
environment variables.
* The resize-pane-up and resize-pane-down commands are now merged together
into a new resize-pane command with -U and -D flags.
* confirm-before command to request a yes/no answer before executing dangerous
commands.
* Status line bug fixes, support for UTF-8 (status-utf8 option), and a key to
paste from the paste buffer.
* Support for some additional escape sequences and terminal features, including
better support for insert mode and tab stops.
* Improved window resizing behaviour, modelled after xterm.
* Some code reduction and a number of miscellaneous bug fixes.
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