New in beta.3
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* Minor	bug fixes

New in beta.2
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* Finished porting all functionality of the old gui (exemplified in version a.5) to the new Qt gui.
* Except -n does not work anymore.
* Now works with Windows!
* File I/O via fopen and fprint.
* Turn on chemostat mode with chemostat(true|false) command.
* Chemostat width and height are settable parameters.

New in beta.1 (Mac only)
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* New gui with buttons, separate work thread
* Releases are now in .dmg files
* The executable is now stuck in a Mac OS X .app bundle and has a pretty icon
* Themes are now settable in gro -- see gro.gro for examples
* print() now prints to the console -- and you can use html tags in what you print.

New in a.5
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* Now there's a changelog!
* Command line now available via ARGV, ARGC.
* New built in function: ( map_to_cells expr end ) returns expr evaluated for each cell.
  See examples/maptocells.gro.
* New keyword: ( foreach i in L do expr end ). See examples/foreach.gro.
* Default parameters are settable outside a cell and initialized in include/gro.gro.
  Also, many parameters now have "ecoli_" prefixes, to pave the way for cell-type specific parameters.
* You can now start the simulation automatically with start().
* run and tumble!
* The -n option (after the filename) starts gro without the gui.
