commands: updates to push docstring. With contributions from mg, hstuart, timeless, and vsh.

mq: remove unneeded local variable in delete

pager: exec pager using /bin/sh -c This mimics the behavior of popen() and ensures setting the pager to something like "LESS=FSRX less" will work.

keyword: offer svn-like default keywordmaps svn-like default keywords can be set in a new configuration section called [keywordset] -- thanks to timeless for the name. Move setup of default keywordmaps into dedicated function used by kwtemplater.__init__ and demo. HeadURL/URL is not supported (by default).

keyword: add 2 svn-like date filters svnisodate yields the format the date in svn's Id keyword expands to. svnutcdate yields the format svn's Date/LastChangedDate expands to. http://svnbook.red-bean.com/en/1.5/svn.advanced.props.special.keywords.html

util: give appropriate default args to atomictempfile() mode='w+b' is the default of python's TemporaryFile().

push: add --new-branch option to allow intial push of new branches Compare this to --force which allows anything to be pushed. With --new-branch, only changesets to named branches not present on the and changesets not introducing additional heads on existing branches are allowed. Developed by Henrik Stuart <henrik.stuart@edlund.dk> Sune Foldager <cryo@cyanite.org>

check-code: add check for 'source'

Merge with stable

tests: fix bashism to load helpers.sh `source` isn't available at POSIX sh.