renaming Terminal to GSTerminal

[Sebastian Reitenbach]

 Hi,

I wanted to add the Terminal to the OpenBSD ports. but it conflicts with 
the Terminal binary of xfce. To work around the conflict I thought I can 
change the APP_NAME in the GNUmakefile to GSTerminal. It rebuild fine, 
and in the end I had the GSTerminal binary installed. However, when I 
try to start it, then I get the following error message:

GNUSTEP Internal Error:
The GNUstep function to establish the argv and environment variables could
not find the main function of your program.
Perhaps your program failed to #include <Foundation/NSObject.h> or
<Foundation/Foundation.h> (or included/imported a different version of the
header from the one supplied with this copy of the gnustep-base library)?
If that is not the case, Please report the error to bug-gnustep@gnu.org.

I'm not perfectly sure what that means to me. Do I can fix it somehow 
via Makefile variables?
I also wonder, whether GWorkspace then still would make use of 
GSTerminal via the services menu, or would it not find it then?

cheers,
Sebastian