* src/parse-gram.y (declaration): Have %parse-param and %lex-param

* src/parse-gram.y (declaration): Have %parse-param and %lex-param
take two BRACED_CODE, not two string_content.
Free the scanner's obstack when we are done.
(code_content): New.
* tests/calc.at: Adjust.
* doc/bison.texinfo: Adjust.
Also, make sure to include the `,' for these declarations.