needed spacing options for gcc

[Tom Tromey]

I'm using GNU indent 2.2.9 on Fedora 8.

I'm investigating using indent to set the canonical style for GCC.
GCC uses the GNU coding style, but with a couple local tweaks.  It
would be nice if indent supported these.

* GCC doesn't put a blank after unary operators, in particular "!".
  So instead of:  if (! foo), gcc would use if (!foo).

* GCC puts a space around the ":" in a bitfield declaration.  So
  instead of:

    unsigned int field:1;

  we use

    unsigned int field : 1;

Tom