CHANGED:  Miscellaneous error handling
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     Improved error handling in many CA-Clipper commands and functions traps
     and reports missing arguments or invalid arguments passed to them.

     One notable example is DBEVAL(), which now produces an argument error if
     the first parameter is missing.  This is notable because the original
     side effect has been used as follows:

     DBEVAL( , , bWhile )

     This produced the same results as LOCATE WHILE, but operated more
     slowly.  This code should be replace with the appropriate LOCATE WHILE
     command.