database::add_file(): Remove obsolete FIXME
pgresult_handle::getisnull(): Add
Do not store synthesized osnames in symboldb.elf_file
database::intern_file_contents(): Use a stored procedure

This saves a round-trip in the common case of a not yet existing row.
rpm_load: Reorganization in preparation for file insertion fast path
pg_query: Extend to 12 parameters
database::add_file(): Fast path for the non-hardlink case
rpm_load: Use database::add_file() fast path if possible