Mostly one word substitutions.
A few function definitions were moved to the scope of
a single script that used them.
Those functions won't be available to third party scripts
except now by cut and paste.
For major release 3.0.
This benefits script authors and testers of ScriptFu.
Now a call to (display "foo") in a plugin goes to the terminal where GIMP started.
Whether interactive or in batch mode.
Make TS errors go to an error port instead of the output port.
Tool plugins: Console, Eval, Server get error messages from the error port.
TextConsole not changed. Tools behave per new doc "ScriptFu Tools" at dev web site.
Driveby fix of SF Server: send whole message instead of byte by byte.
Driveby comments and more semantic checking of set-output-port in TS.
Add test plugin test-display.scm
