
* Update the manual although the new version is backwards
  compatible with the old version.

  The only exception is PgLargeObject but the old version was
  not usable (segfaulted) anyway.


* Rewrite PgCursor and PgTransaction so that they execute in an
  PgDatabase context instead of creating a new connection for
  each cursor. This change is the same as implemented for
  PgLargeObject

+ Rewrite all the examples

+ Check why examples/testlo writes an empty file when given
  an existing LargeObject oid.
