Super Dev Mode: copy GWT-RPC policies to launcherDir

Also, fix a bug setting the wrong module base directory
when using bookmarklets and the code server has just
restarted.

This is so that policy files show up in the same place
as they used to in DevMode, making gwt.codeserver.port
unnecessary in DevMode -superDevMode.

Change-Id: I87659ca2605b05078a3cc4b74ce72d6fcd04a14f
Review-Link: https://gwt-review.googlesource.com/#/c/9519/
CellTree: fix KEY_UP navigation bug

When the previous entry is open and has descendants, the
up arrow didn't go to the previous line.

Change-Id: I4706b54d86c0bc14bead286db627cbee27713708
Review-Link: https://gwt-review.googlesource.com/#/c/9544/