[Clp] Grammar underlying CoinModelUseful2.cpp

[David Einstein]

Is the precise grammar for the expressions for CoinModel (the one shown at
the end of examples/addBits.cpp) documented somewhere.  It appears that
there is slightly more than +-*/^(), but reverse engineering the pda is not
something I would be likely to enjoy.  If there is no doc, are the original
yacc and lex files available?

On a related note, would adding a new primitive function, say floor to the
parser, be as simple as adding

inline double floor_wrapper (double x) { return floor(x) ; }

around line 770 of CoinModelUseful2 then adding

{"floor", floor_wrapper},

to the arith_fncts array?

It appears to work, but I am loath to go around monkeying with yacc output.
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