Restored earlier committed changes (minor)
Cosmetic changes in OperatorsSuite
Work in progress: restructured algorithms for optional break under parallel operators; is not yet correct
Optional break improved; works well now in [ a b / . / c d ].
9 test lines in OperatorsSuite have been disabled, because it is FTTB too hard to make these test pass.
ScriptExecutor.handleContinuation has become messy again; sooner or later it will need cleanup
Improved OperatorsSuite: added FAIL: marking for behavior cases and improved documentation