proof_of_concept/sql-2003-2.ebnf: <COBOL nonnumeric> and <COBOL host identifier> fixes
proof_of_concept/sql-2003-2.marpa: use | character
proof_of_concept/bnf2marpa.pl: let LATM in G1 handle ambiguity
SQL/AST.pm: say the AST tree is an XML::LibXML thingy
Grammar/ISO_IEC_9075_2_2003.pm: rearranged grammar
ISO_IEC_9075_2_2003/Actions.pm: use parent
Grammar/Actions.pm: common actions