Renaming insight to `insight'

[Tom Tromey]

Eli> I consider that a bug in the current version of the manual.  I
Eli> think it should say which one of -w and -nw is the default.

I agree that is a bug.  However, I don't plan to fix it.

>> Also, insight isn't part of gdb, so additions there aren't
>> necessary.

Eli> The change we are talking about is for top.c in the GDB
Eli> distribution, no?  So it _is_ relevant for GDB, I think.

This change has no effect observable by anyone running the official
GNU gdb distribution.  The official GNU gdb doesn't include a GUI.

Tom