JAL-3446 from applet; JAL-3374

JAL-3446 from applet; JAL-3374

- JalviewJSApp interface updated
- Jalview "noannotations" fixed
- AlignFrame show annotations menu item when started with noannations
fixed
- reorganization of timing of setting range start/end and scrollbar
values solves (many) timing issues in SeqCanvasTest and
AlignmentPanelTest, which were due to asynchronous delayed repaints
setting range values in paintComponent(g) way too late.
- correction of font checking in AlignmentPanelTest - "VERY LONG LABEL"
not long enough after adding "MMMM" in a prior test
- corrections for "isMac()" (now "!isWin()") in tests
- addition of Jalview.isInteractive for SeqCanvasTest -- still an
occasional conflict with previous test when in batch mode
- addition of Jalview.allowServices for simple tests (using -jabaws
"none"), allowing them to not run unnecessary service look-up threads
- centralization of AlignmentViewport firing of "alignment" property
change for sanity only
- adding of "sequence" property change for notification of need to
refresh the horizontal scrollbar after changes in range and scrollbar
update timing

- still a minor issue with noannotation starting up ok, but the first
annotation spilling over into scrollbar space (is that a filler?)