Suppress plotting of list mode data

[willend]

There is often very little physical meaning in plots of "event data" from Monitor_nD, it also happens very often that the data become very big and hence take long time to load.

I therefore propose to avoid writing a data-section to mccode.sim in such cases, simply by adding an if-statement to the detector_out_2d() function:

        /* If this is list mode we suppress the mccode.sim entry*/
	if (!strcasestr(detector.format, "list")) {
	  /* Write data set information to simulation description file. */
	  siminfo_out("\nbegin data\n"); // detector.filename
	  mcdatainfo_out("  ", siminfo_file, detector);
	  siminfo_out("end data\n");
	} 

Implemented this way, output to Mantid/NeXus is unaffected and we avoid plotting in the ASCII case.

[willend]

An exception where this solution seems not to work perfectly is when

options="multiple list ..."

• entrypoint to the plotting logic apparently lives elsewhere...

[farhi]

The other solution is to detect the 'list' type in the header/metadata, and not plot it. Removing all the metadata from the generated file brings a raw list of numbers which are not anymore self explanatory.

[willend]

The solution proposed does in fact not suppress all metadata, it simply removes the corresponding Data section in mccode.sim. The actual event file remains including all content.

[farhi]

Related to #292 and #1150