Application of S-, D, X, ? labels:

incompleteSidechainsCount

Re S-: In notes, see Counting AAs/Nucs, moreFind: findbb, mainchain.

scriptToJmol() in top.js calls 
	makeLabelsSpt() for S-, D, X, ? (in top.js)
		makeMarkIncompleteSidechainsSpt() in scripts.js

S- LABELS
	Are controlled by labelsOn and labelIncompleteSidechains (false by default when >100 icsc).

	In the molinfo tab, whether or not S- is applied is reported in incompleteLabeledSpan
		with incSCLabTxt which is generated in
			sayIncompleteSidechainsLabeledOrNot() in controls.js

	In the Introduction, makeIntroHelp() (help.js) announces S-.

	See also toggleLabelsShow() in jcontrol.js 

TEST CASES:
	5mct 5MCT protein DNA S- protein only
	1BDX 1bdx protein DNA backbone atoms only
		S- is not shown & intro does not mention.
	6hww 6HWW to many to show S-. check intro. 98K atoms so difficult to work with.
	1L9Z 1l9z is missing all sidechains of DNA and protein.
	MORE in Evernote.
	MORE in notes.htm#icsc