Changes:

1. doesn't use temp files – does everything in-memory. makes the whole process *way* faster
2. allow setting header information using postgresql log_line_prefix syntax
3. removes dependency on readonly perl module – it is not really common module, and the functionality in this program is very limited
4. allows setting database to track as command line option, or track sqls from all databases

SVN repo at: http://svn.depesz.com/svn/pgsql-tools/trunk