Fix skipped protocols in grammar

[raquelalegre]

ATF protocols are currently being skipped by yacc:

    """skipped_protocol : ATF USE UNICODE newline
                        | ATF USE MATH newline
                        | ATF USE LEGACY newline
                        | ATF USE MYLINES newline
                        | ATF USE LEXICAL newline
                        | key_statement
                        | BIB ID newline
                        | lemmatizer_statement"""

The only one being processed at the moment is the language protocol.

All ATF protocols, including language, should be added to an array of protocols in the text object.

[jamespjh]

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