Show storage location of lane configuration settings on hover
instead of via color coding.
Verify lane plugin classes exist when updating settings
Parameters stuff:
* Pushed logic for transforming database values into PHP variables
  into the ParametersModel class to ensure loading consistency
* Added a validation step on the install index page to check whether
  anything in ini.php differs from the parameters table. Discrepancies
  are automatically resolved by rewriting ini.php with the value from
  parameters.
* Added asterisks denoting the handful of fields that are purposely
  saved to ini.php.
* Removed all references to the older opdata.lane_config. Besides not
  being 100% sure it worked, there's no need to have configuration data
  in three separate places. Two is confusing enough.