I have added various improvements to OMPython. The improvements are helpful for automatic testing/analysis using OMPython as demonstrated in the OpenFDM project.

* I moved the main shell interface into OMShell, which makes it more friendly to use.
* I added error checking to the execute command. The execute command can handle multiple line statements with error handling on each.
* The run_script command just calls runScript. I do a regex to look for fail or error on the string that is returned. I tried to do individual script line parsing, but it was too much work for now.