* Document the connector API method is_transaction_active()
* Move mysql::connection_base::is_transaction_active() to the other transaction-handling methods.
* Add more tests for mysql::connection::is_transaction_active()
* Add postgresql::connection_base::is_transaction_active()
* Add tests for postgresql::connection_base::is_transaction_active()
* Change the type of the SQLite3 transaction status from transaction_status_type to a boolean flag.
* Add sqlite3::connection_base::is_transaction_active()
* Add tests for sqlite3::connection_base::is_transaction_active()
* When closing a transaction do it in the following order: report (if any), execute SQL command, set transaction active flag to false.
* Replace connection handle method check_connection() with is_connected() and ping_server()
* When a connections is fetched from a pool perform a validity check which can be one of none, passive or ping.
* Add the methods is_connected() and ping_server() to the connection template class.
* Remove unused #include and add mising #include.
* Add tests for the connection methods is_connected() and ping_server().
* 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().
Add support for connection pooling
* Add support for connection pooling to the core code.
* Add support for PostgreSQL connection pooling with tests.
* Add support for SQLite3 connection pooling with tests.
* Add support for MySQL connection pooling with tests.
* value: add missing includes
* mysql, sqlite3: use explicitly *out* stringstreams for serialization
* postgresql: fix: use max_digits10 instead of digits10
* detail: add float_safe_ostringstream, ensuring floats are serialized with enough precision
* mysql, postgresql, sqlite3, tests: fix: set float-precision for all streams
* run clang-format on changed files
* inline remove_cvref.h
* replace unspecific "wrapper" with concrete type name
* tests: split connector specific tests out of serialize/Float
Add Connector Cmake logic
* Also install date when used with fetch content
* Install everything always
* Update documentation
* Add option to control dependency searching
* Adjust travis
