Writes or updates the named FITS keyword record with the given Double value.
Plate.WriteFITSDouble(Keyword, Value, Decimals)
The method syntax has these parts:
| Part | Description | 
|---|---|
| Keyword (String) | The keyword to write or update | 
| Value (Double) | The new Double value for the keyword. | 
| Decimals (Single) | The number of decimal digits to include | 
| Return (Boolean) | Success or failure (generates trappable error on failure) |