Summary
- do not mark a Node as potentially spurious if it has a _Keep attribute; mark Nodes on axis of revolution of a REVOLVE command with a _Keep attribute; mark Nodes in JOIN or UNION that are in common with both parents with a _Keep attribute; mark new Nodes due to a scribe (via SUBTRACT a NodeBody or SheetBody) with a _Keep attribute; mark Nodes at beginning and end of RULE and BLEND with a _Keep attribute; add REMOVE_SPURIOUS compile-time option to remove spurious Nodes; add spurious* test cases; fix bug that made sensitivities of scribes susceptable to roundoff errors; fix documentation associated with SUBTRACT command
- Remove dos line endings. Fix Windoze compile error.
- update SBOs so that they avoid creating spurious Nodes