Command SaveNextImage :

Will save the next frame coming in from the camera while the acquisition is running and without interrupting it.
Settings of FileDir/FilePrefix/FilePostfix are taken into respect.
If input argument is true, FileStartNum will be incremented and an index number will be appended to the filename.
Otherwise not.
Use this to take a `snapshot` if you run acquisition without FileSaving
set to true.

SaveNextImage Definition
Input Argument	Tango::DEV_BOOLEAN	true: increment FileStartNum, append index number to filename false: do not increment FileStartNum, do not append index number to filename
Output Argument	Tango::DEV_VOID
DisplayLevel	OPERATOR	..
Inherited	false	..
Abstract	false	..
Polling Period	Not polled	..
Command NOT allowed for	ON FAULT EXTRACT	..