fixed "console command" in the comments of demo models
more style fixes courtesy of PyCharm inspections
added assetFalse assertion
added tests for all() and any()
support branches in get_rev and fix local rev
fix environment variables being leaked outside of the release script, add more checks/questions and comments
convert release script to Python
misc polish for release script, don't copy documentation twice
document all and any
 * renamed barchart to bar and piechart to pie, to use the same names than mpl
 * added grid argument to all charts (defaults to False except for bar charts)
 * added colors argument to all charts
 * added barh, but the axes are currently messed up
 * fixed barchart position when width is customized
made most charts use the same "prepare" code
more work on charts, accepting more kinds of input and styles for plot(), colors in the style strings are not supported/ignored
remove commented code
moved styles support to Plot.prepare
more TODO
nothing to see here yet
allow saving charts to files (and convert all charts tests to create files instead)
* started to document charts
* use .. note:: where applicable (there are probably more place where it should be used)
* refactor Expr operators, removing simplify et al (unused)
* started implementing SSA (WIP)
allow charts to be saved to several formats at once by using '&' in the extension: eg: fname='plot03.png&pdf'