forked from GitHub/gf-core
+ Make room for function names in the BracketedString data structure. + Fill in function names when linearizing an abstract syntax tree to a BracketedString. + Fill in wildCId when it is not obvious what the function is. + Function bracketedLinearize: for compatibility with the other linearization functions, return Leaf "" instead of error "cannot linearize". + Export flattenBracketedString from module PGF. + PGFServce: make function names available in the JSON representation of BracketedString.