New parser and command line functions

[Rik]

3/13/13

John,

You might want to take a look at the parsing of command line functions.  I
tried this,

octave:1> function y = mysin (x)
> y = sin (x);
> endfunction
�: interpfcn/symtab.h:2039: static void
symbol_table::set_curr_fcn(octave_user_function*, int): Assertion `scope !=
xtop_scope && scope != xglobal_scope' failed.
Abort

and got thrown back to the shell. 

Not that I want to invest the time, but this bug and the previous one with
debugging, could only be caught by an interactive test suite such as one
written with expect.  Our current m-file based strategy doesn't get at these.

--Rik