remove need for template scanner

[KrisThielemans]

Since STIR 6.3, a template scanner is no longer required for lm_to_projdata. Removing this could therefore simplify things a lot. This would need to be verified if it actually works (i.e. if there's sufficient information in the .hroot file).

Locations where it could be removed.

STIR-GATE-Connection/VoxelisedSimulation/UnlistingTemplates/lm_to_projdata_template.par

Lines 8 to 9 in 3d5e6c2

	; template_scanner.hs is delivered by `SubScripts/PrepareScannerFiles.sh`
	template_projdata := UnlistingTemplates/STIR_scanner.hs

STIR-GATE-Connection/VoxelisedSimulation/SubScripts/PrepareScannerFiles.sh

Line 37 in 3d5e6c2

cp -vp $D690_DIR/STIRScanner_D690_full_segment.hs UnlistingTemplates/STIR_scanner.hs

STIR-GATE-Connection/VoxelisedSimulation/SubScripts/PrepareScannerFiles.sh

Line 45 in 3d5e6c2

cp -vp $mMR_DIR/STIR_scanner.hs UnlistingTemplates/STIR_scanner.hs

and obviously the template .hs files.