New in a.5.1
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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 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().
