apiBBOnly is false by default, but is meaningful only if apiGotten is true.

onlyBBDeposited
	- Is true when the LOADED MODEL (possibly simplified) has about the same number
of atoms as residues.
	- Therefore it is a misnomer. Maybe we need onlyBBPresent and onlyBBDeposited?
	- BEFORE MODEL LOADED: It is set in scripts.js without reference to apiGotten when
			atsize ~= atresidues which are
				based on api, or
				for dotPDB when urlHasBU (from query parameters), based on
					auNonHCount, auBBCount each * bu2AU.
	- AFTER MODEL LOADED: It is set in modeldat.js without reference to apiGotten when
			proteinNonHCount == alphaCarbonCount &&
			nucleicNonHeteroPhosphorusCount == nucleicNonHNonHeteorCount &&
			either alphaCarbonCount or nucleicPhosphorusCount is nonzero.

proteinAlphaCarbonsOnly

nucleicPhosphorusOnly // nucleicPhosphorusCount // nucleicNonHNonHeteroCount

simpBBOnly is true (all scripts.js) when
	- forceBBOnly (&bbonly=N)
	- atsize, atresidues vs. consurf cutoffs.
	- *** BAD simplification optional (requires API or QP) and onlyBBDeposited
	- simplification optional and option accepted
	- atsize >= unconditional cutoffs (consurf or not consurf)
	- if forceBBOnly && (!API && !QPsizes && forceBBOnly) ==
			if (dotPDB && (bu2AU == -1) && !consurfFilename)