FYI: glr.cc

[Akim Demaille]

It works well for me.  For instance the example/calc++ directory
works with a change using glr.cc instead of lalr1.cc.  Similarly,
the project I made this for used glr.cc without a single change,
and also works fine using %nondeterministic-parser: this allowed
me to remove so grammar massaging to cope with a local ambiguity
of my language at hand.

There are several remaining issues:
- using cdebugstream instead of stderr
- yyuserAction should probably become a part of the parser
  class instead of a free function, at least to obey the exact
  same rules of accessibility (friendship with the parser class
  does not extend magically to yyuserAction).
- writing test cases

I chose to wrap the C glr parser in a C++ class because that seemed
to simplest.  Alternatively one could have written a full parser
from scratch (far from my favorite, but the best result), or
change glr.c so that function declarations could become member
function declaration.  I tried to protect glr.c as much as possible
from this, but in retrospect, in selected places (e.g., yyuserAction)
it might be a better choice.


NB: To install it, I first need the glr.c change to be installed
(the one factoring the shared declarations into the header).

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