Implementation also includes changes in GPRE, but this utility is not complete - only commands, used in ISQL,
are working in code generator for new API.
New interface IUtl is added - it performs tasks, related with database objects (attachment, transaction, etc.),
but not requiring routing in YValve, i.e. client only tasks.
This change is to make applications who define they own message format (without metadata inspection and coercion) to easily create its IMessageMetadata.
1. Never allocate empty statement - always use att->prepare() to create statement interface
2. Separated IStatement into 2 parts - statement itself and resultset.
3. Added stmt->openCursor() (and att->openCursor() for unprepared statements) to create IResultSet.
4. Always use IMessageMetadata (former IParametersMetadata) to pass message fromat info from client,
therefore avoiding need in BLR generation in client applications.
