Fix for ? expression operator, fix for expr tcl command.
Fix references to list.bool in ex_dict_cmds and objtype_bool.
Fix for calls to I.exec in ex_dict_cmds (dict for and friends).
Fix syntax checking in split and join commands.
Fix parser parse_escape function that would eat \ escaped single chars if there was a digit after it that looked like octal (and incidentally fixed octal escapes too).