Remove help_panel files and calls thereto

[butler]

Each module has their own infrastructure for showing help which is oddly not used anywhere!!! To complete the documentation infrastructure change started at code camp II we need to

1. Add help buttons to each panel that links to the proper help using the new infrastructure.
2. Remove the old code in the module frame that calls the help
3. remove the help.py code for that module

[butler]

Remaining as of 3/22/15

• Fix Invariant
  • Add button button
  • Create event function to call help
  • Remove old function for calling help (which was not bound to any event anyway)
  • Remove the help.py associated since not in RST picked up by Sphinx
• Fix P(r)
  • Add button button
  • Create event function to call help
  • Remove old function for calling help (which was not bound to any event anyway)
  • Remove the help.py associated since not in RST picked up by Sphinx
• Ensure that size of tool boxes and positioning works on both macs and PC

[butler]

I believe this is now all done. ALso added close buttons on the 3 panels that did not have one to finish the consistant look and feel.