Command GetDarkSpectrum :

Read dark spectrum and store it in file given as input argument.
Data from the file will be read and used immediately, the file name will
be written to attribute DarkSpectrumFile.

GetDarkSpectrum Definition
Input Argument	Tango::DEV_STRING
Output Argument	Tango::DEV_VOID
DisplayLevel	OPERATOR	..
Inherited	false	..
Abstract	false	..
Polling Period	Not polled	..
Command NOT allowed for	FAULT MOVING	..