I noticed a few panic messages contained newlines, and one included a naked
carriage return. panic() adds a newline itself, and also generally ensures
the message will be on a new line (the initial "oops" ensures the message
itself will be on a new lines). This patch removes the unneeded characters.
Too much code was being shared between the extended command window
and the popup dialogs for player selection, causing an uninitialized
variable to be referenced, often resulting in a core dump.
