tokenizing STRING can leave off last double quote
tokenizing STRING can leave off last double quote

this allows an incomplete STRING to be reported correctly:

    bp(GOBP:"Apop
    IDENT("bp", 0, 2) O_PAREN("(", 2, 3) IDENT("GOBP", 3, 7) COLON(":", 7,
8) STRING(""Apop", 8, 13)

nbargnesi/libbel,OpenBEL/libbel,OpenBEL/libbel,nbargnesi/libbel