[Grace-core] minor language issues

[James Noble]

Hi all

Michael and I have been going through parsing as part of
working over the whole spec that we're finally getting to:

a few smallish issues:

- should spaces be required around operators?
  e.g. should "1+2" be legal, or should we be required to write "1 + 2".
  requiring spaces solves a bunch of issues wrt brackets & generics

- should more than statement be permitted on a line?
  e.g. should "a;b;c;" be legal, or should we have to break the lines, thus:
    a
    b
    c 
 
- there's no way to pass *no* varargs parameters. 
given a multi-part method with varargs we can't call then with
no arguments, because "()" is supposed to be illegal.

e.g. x.foo(1) foo(11)  and x.foo(1,2) foo(11,22) are both legal, but x.foo() foo()  is not. 

We don't have this problem with single-part requests because x.foo(1)  and  x.foo are both legal requsts

I don't think operator requests can take varargs.

James