Adding simple example for testing
Reenabled saving of data to file
Minor change to simple example
Ignoring generated *.dat files
Slightly simpler example1.xml
Adding quick test scripts for install & run on python 2 & 3
Moving exportsom into main source; renaming exportdlems
Enabled command line option:
   python pylems MyLEMS.xml -dlems
to convert LEMS file to JSON based "dLEMS", or distlled LEMS.
This will facilitate code generation by use of JSON friendly templates
spelling abscissa
fixed exporting of isolated elements (i.e. not part of a population)
derived variable ordering using func in sim/build.py
Merge branch 'master' into development