Update configuration figure for new configuration variable names.
Move text in configuration figure.

Text was landing outside of the figure's box.
Rename 9 of the configuration variable.

The new variable names are intended to convey sense (positive/negative)
correctly.

- Edit all configuration YAML files with new names.
- Update all test code with the new names.
- Modify @moorepants' somersalt test code to also check for these 9 newly
  deprecated names.
- Extend @moorepants' somersalt deprecation warnings to these 9 newly
  deprecated names.
- Update GUI code with new names.
- Update sample CFG dicts in ui.py with new names.
- Update configuration figure (SVG and PNG).
Choose better bounds for hip extension.
Reword deprecation warning for cfg names.
Clarify variable names in test.
Rename CFG variable PTfrontalFlexion->PTbending.
Fixes to get tests to pass.
Merge pull request #87 from chrisdembia/issue65

[WIP] Addresses issue #65, configuration variable names denote sense.