refs #5872 removed loadExperimentInfo from LoadMD

it is not used there any more.
refs #5872 Verified MD box volume by relative value rather then abs.

This substantially affects amount of logging done in debug mode
refs #5872 Modified Slice MD to use box controller

instead internal conditions
refs #5872 changed box size checks to reller rather then abserr

according to the changes in the LoadMD operations.
refs #5872 No -- this check error in the box volume
refs #5872 typing error
refs #5872 Increased accuracy of Box tree loaders and

modify the CompareMDWorkspaces to check reller rather then abserr on large data.

This is because system test requesting 10-5 accuracy was failing on comparing boxes volumes.

The ultimate solution would be the changes in MDBox structure but it is subject to another ticket.
Merge remote branch 'origin/defect/5872_SliceMDInterupt'