File Release Notes and Changelog

bugfixes for some tools.
All tools now run on FreeBSD.

Makefile: added install permissions
Makefile: create missing directories
Makefile: don't dive into htdocs directory on all: target
TODO, dbrelationsize, listlock: FreeBSD fixes
pg_file2str.pl: fixed valid PostgreSQL escape characters
pgcomment: strip column whitespace
pgcomment: use escaped literals for COMMENT ON