(*) Make result::errorposition() etc. public.

Build & Configuration
(*) Move PGHOST guessing logic from tools/preprelease to Makefile.am?

Connections
(*) Support scoped/unscoped non-superuser identity (outside transaction only)
(*) libpqxx-level trace output

Exceptions
(*) Document exception guarantees (weak / strong / poorly defined / pure)

Results
(*) Real encoding support (PQmblen(), PQenv2encoding())
(*) Conceive metadata model

Streams
(*) Provide metadata information in tablestream
(*) Can we have a tablestream that looks more like a result?
(*) Create "inserter" class for column lists
(*) Allow single-level insertion with endt/endr manipulators
(*) Streambuffer class?

Tests
(*) Test broken connections
(*) Test tablereader and rows ending in empty fields