interpreter struct so that custom cbuf data can be reset after an error.
This fixes a bug where GIB would think it was still waiting for a return
value after an error occurred in an embedded command.
This prevents var substitution from being performed on the return value
of a function. The local variable ifs can now be set to specify a custom
field separator for use in for loops. file.find will also insert ifs
between file names instead of a space if it is set. file.find will also
no longer put . and .. in a list of file names.
to prevent conflicts with math expressions. All clients and servers are set
to create buffers with the normal parser. However, scripts ending in .gib
are now executed in a GIB buffer, and the export command can be used to
make specific GIB functions available to normal command buffers (i.e. the
console).
