comment fixup for 3175a1b5f
made it easier to switch back to the MUD window

Clicking on the MUD output will now selectively give the focus to the
input line. So one can click "vaguely on the MUD window" and type
commands at once.
fast focus: worked around an IE10 bug
disabled the IE warning

... I do actually support that platform (yuck).
removed a few remaining references to Discworld

The DecafMUD codebase should be MUD-agnostic (except for the About box).
do not throw if merely not connected

I added MUD-specific code to handle unhandled throws as fatal errors,
displayed as a "oops" to the user and reported to the server. So
exceptions shouldn't be thrown for common errors.
disable F1 and F5 browser actions

Disabled the built-in browser actions for F1 and F5, so that MUDs may
define macros for these keys without bad side effects.
bumped to v0.9.1-beta