/sqlite3cc

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- turn transaction in to basic_transaction and create transaction, exclusive_transaction and perhaps recursive_transaction?
- expand sqlite_error - perhaps use boost::system_error (see boost/asio/error.hpp for an example of extending system_error)
- see if we can #include "sqlite.h" in to a namespace. Cons: no easy access to real sqlite stuff. Pros: can't access database::_Handle anyway, so Cons don't matter and we better encapsulate the library
- fix "make check"