* Move the PostgreSQL date/time parsing code to common functions in sqlpp::detail
* Use the common date/time-parsing functions to parse the MySQL date/time results.
* Use regular expressions to parse date/time strings in the SQLite3 connector
* Move the code for sqlpp::mysql::detail::connection_handle_t to include/sqlpp11/mysql/detail/connection_handle.h
* Move the code for sqlpp::mysql::detail::prepared_statement_handle_t to include/sqlpp11/mysql/detail/prepared_statement_handle.h
* Move the code for sqlpp::mysql::detail::result_handle to include/sqlpp11/mysql/detail/result_handle.h
* Rename sqlpp::mysql::detail::connection_handle_t -> sqlpp::mysql::detail::connection_handle
* Rename sqlpp::mysql::serializer_t -> sqlpp::mysql::context_t
* Add const qualifiers to sqlpp::mysql::context_t::escape() and its parameter.
* Rename class/struct types, variables and functions from CamelCase to snake_case.
* Remove a superfluous function that forwards the call to mysql_close().