Progress: featureless make.

Progress: featureless make.

Finish implementing the return code processing.

Allow the return failure strategy to be tweaked via the setting 'fail' which can have one of the following:
- exit: exit program on failure.
- warn: do not exit and if in verbose mode, print warning.
- ignore: do nothing.

The reserved parameter variable "return" is populated with the return result value.
For example, you can see the return result by adding the following after a run, shell, or similar operation:
  print Return Code is parameter:"return"

Add some additional warnings when loading settings.