standardize the local usage functions #71
Merged
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All modules define a local function call usage () that reports the module usage. It normally takes the API pointer and a mode argument. However, a few took an arbitrary 3rd argument as well. My plan is to introduce a new function that will accept the usage function as an argument and do the right things depending on modern or classic mode, hence all usage functions needed to have the same number of arguments. This change to pstext and mgd77track. accomplishes that.