Sqlconvert

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* Split extended INSERTs (library and tests, scripts will be extended later).

* Extend tests, increase test coverage.

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* Change quoting style to MySQL, PostgreSQL or SQLite.

* Add a test for print_tokens().

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* Condense a sequence of newlines after a /\*! directive \*/;

* Rename remove_directives -> remove_directive_tokens.

* Unescape strings. Add a test for Postgres.

* Use SQLObject for string quoting and connection handling for tests.

* Use pytest, coverage and tox for testing.

* Add tests for Postgres and SQLite.

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* Remove /\*! directives \*/; and newlines after them.

* Join group-{file,sql}.py into demo-group.py
* parse-{file,sql}.py into demo-parse.py.

* Add demo-process.py.

* Fix: flush buffer and outfile.

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* Add MySQL-specific remove_directives() and process_statement().

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* Rename the project: mysql2py -> sqlconvert.