Extend set/get param interface to have knowledge of what type of operation it is...

Extend set/get param interface to have knowledge of what type of operation it is - i.e. is it related to file i/o or display/cut/copy usage.

This means differing actions can be taken dependent on the usage, such as in determining if conversion operations are required.
Thus when called from file.c the parameter is set to true, and elsewhere it is set to false.