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Point-volume calculation and LDR benchmark#167

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ChasingNeutrons wants to merge 7 commits intoCambridgeNuclear:mainfrom
ChasingNeutrons:volc_calc_and_LDR
Open

Point-volume calculation and LDR benchmark#167
ChasingNeutrons wants to merge 7 commits intoCambridgeNuclear:mainfrom
ChasingNeutrons:volc_calc_and_LDR

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I made the LDR Lite benchmark: https://serpent.vtt.fi/kraken/images/3/3d/LDR-PUB-VTT-100002-R2.pdf

This appears to agree well with Serpent.

When debugging it, I briefly convinced myself that the rayVolPhysicsPackage doesn't work. I think it does, but meanwhile I wrote a physics package that does the same by point sampling. Do we want this? If not, I can separate this out.

Added in the BEAVRS model with the D-bank partially inserted. Also fixed
a flaw in the geometry where the outermost cell was defined such that
there could be a rare particle lost between it and the geometry
boundary.
It is desirable for input to allow some universes not to be offset as
might be done in a lattice. ALternatively, it may be preferable to
evaluate their locations in the global reference frame. The former has
been done by allowing lattice universes to have an 'offset map', the
latter has been done by allowing a chosen universe to be evaluated in
global coordinates. This allowed a fix to the BEAVRS inputs to correctly
position the instrumentation tubes.

There seems to be a dictionary error with the offsetMap. Occasionally it
is not recognised as an integer list. This has prevented the creation of
a new test in latUniverse. This has been commented out until the
dictionary has been fixed.
Added description of offsets in latUniverse and global in universe to
docs. Also added an example of the offsetMap in the form of a 2D CROCUS
input.
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