Use internal n-triples string parsing to get a literal

(rasqal_new_literal_from_ntriples_counted_string): Added
update libsv
For TSV parsing set option on libsv to not parse quoted fields.
Parse TSV fields as N-Triples

After http://www.w3.org/TR/2013/REC-sparql11-results-csv-tsv-20130321/#tsv

(rasqal_rowsource_sv_data_callback): Use
rasqal_new_literal_from_ntriples_counted_string to parse the fields

NOTE: This is not totally correct since it does not handle turtle
abbreviated forms such as integers, booleans.
Declare raptor_unichar rasqal_unicode_max_codepoint once