redhat_readme.txt: (1) Fixed instructions for pg_hba.conf which caused psycopg2 bugs, (2) renumbered sections, (3) added table of contents.
install/redhat/pythonsetup.py: Small refactoring of output that asks user to allow packages to be installed.
install/redhat_readme.txt: Formatting fixes.
install/ubuntu)readme.txt: (1) Added table of contents, (2) Renamed and renumbered sections, (3) Moved postgresql configuration to happen before installing pip dependencies.