[py3k] Unicode everywhere, drop as_string()'s 'encoding' parameter
WARNING: This is an API break
Among other things we no longer use repr() for String constants, which
means they consistently get quoted with double quotes instead of a mix
of single and double quotes.
Closes #1190507
YAPPS=yapps
rql/parser.py: rql/parser.g rql/parser_main.py
${YAPPS} rql/parser.g
#sed -i "s/__main__/old__main__/" rql/parser.py
#cat rql/parser_main.py >> rql/parser.py