v0.1.731

Pre-release of RIDE 2.0

Changelog:
Mac menu
re-enabled selection of UI elements
ignore stdout and stderr from spawned interpreter
at start of line increases indentation
rm forgotten console.info()
sped up build a little
nwbuild was invoked twice in dist.sh
don't do "npm install" on manual build
disable selection of UI elements
fixed a bug in removal of breakpoints
tolerate 3-letter command codes (CBP in particular)
BK/FD are "undo/redo" in editors
editor.coffee: small touches and more comments
avoid error when running as a web server
refactoring: no need to check if callbacks exist
save breakpoints on Esc even if text is unchanged
support multiple screens when restoring window position
rm highlighted line when tracer turns into editor
renamed "Keyboard Preferences" to "Preferences"
let interpreter show its own prompt in del editor
added menu item for weak interrupt
don't print "updating icon" unless building for Windows
un-inserts empty line at eof
D.bb() returns last 1000 log messages