- allow ()'s and {}'s for now when parsing calls/composite literals

- allow ()'s and {}'s for now when parsing calls/composite literals
- require ()'s around composite literals at the if/for/switch control clause level
- fixed a nasty bug: passing a value instead of a pointer to a value to an interface
  variable - and not noticing that the value is copied

R=r
OCL=25649
CL=25649