Progress Meter

//*****************************************************************
// Function ProgressMeter routines
//*****************************************************************
// Routines to create, update and destroy a little progress meter. This uses
// igor drawing commands in a panel. Data is normalized to a 0 to 100 unit
// scale and meter is updated every 5 units (20 increments).
// Truncates name to 40 characters and ensures that name is igor legal. Always
// use return value (string) from ProgressMeterCreate as MeterName parameter
// for ProgressMeterUpdate and ProgressMeterDestroy.
// Checks ckbShowProgress to see if progress meters are to be displayed.
// Programmer can select meter type or let it be selected by options panel (with type 0)
// type 1: thermometer, type 2: digital (numeric), type 3: clock.
// Update Meter routine returns "100" if named meter doesn't exist.