Fixes and improvements for SPAM and volmap, 3d grids#838

Merged

drroe merged 7 commits intoAmber-MD:masterfrom

Aug 22, 2020

Commits on Aug 21, 2020

Start importing changes from the fixspam branch. Improved formatting for OpenDX files, option to read grids in as double precision, enable DIV and MULT for grids, warn if extra args remain after 'p…
drroe
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Update dependencies.
drroe
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Changes from fixspam. Peaks are stored in a data set now. Allow volmap to be compiled double precision if desired. Fix some uninitialized vars.
drroe
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Clean up the volmap and spam manual entries.
drroe
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Add type keyword to OpenDX read help and manual entry
drroe
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Add description of the sets created by SPAM.
drroe
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Increment revision for SPAM/volmap improvements.
drroe
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