Scripting with Scheme and Python

[edb]

I'm still making changes to this plugin before a pull request. Here are some of the things needed to be done first:

• A new documentation system built on top of the current help text window was created for the scripting documentation, that should be done soon. So instead of the PDF that was provided previously, the new documentation for all the scripting information will be available within wings.
  
  
• The function documentation for we function is now partly generated from an data file that also provides type information for the scripting plugin to convert lists to erlang data structures like sets and trees automatically, as well as for keeping track of the winged edge structure.
  
  
• I'm making some test scripts to test the we functions.