Variants of the 'o' command:
	o		open the current line
	o+ or o;	make a new line after the current one
	o-		make a new line before the current one
	o:		make a new line instead of the current one
Control key functions in the 'o' command:
	char:	advance ^Q  [->]      line:   display to end  ^E  [ ]
		backup  ^U  [<-]	      reset to start  ^S  [^]
		delete  RUBOUT		      delete backward ^X
	word:	advance ^A  [>>]	      delete forward  ^F
		backup  ^B  [<<]	      release margin  ^G
		delete  ^W		      re-type	      ^R
		spell	^V  [SEND]    exit:   with new text   ESCAPE
					      unchanged text  ^C
Other characters [including RETURN] are inserted as typed
Symbols in [] are the equivalent BLUE keys on QMC ITT terminals
