JAL-3026 JDesktop/JInternalFrames support + relative URL file loading

JAL-3026 JDesktop/JInternalFrames support + relative URL file loading

- preliminary
- no minimization to JDesktopIcon
- no maximization
- z-order not checked

See JalviewJS2.java

new SwingJS-site.zip

AlignFrame.java:

JS bypass for addServiceListeners()

AppletFormatAdapter.java:
DataSourceType.java:
FileParse.java:

adds DataSourceType.RELATIVE_URL

for indicating files relative to the HTML page.

Desktop.java:

JS bypass for Console, Dialog Thread, News, Vamsas, and URL links

Jalview.java

JS bypass forparsing h, help, nodisplay, nogui, jabaws, startup example.