clean up old cruft regarding rsyslog packages
install toc: move more important things first
add "outdated" warning
move outdated section to bottom
Merge pull request #38 from rgerhards/v5-stable-modules

V5 stable -- warn about outdated doc
Resolved merge conflicts in source/configuration/modules.rst
Merge pull request #36 from rgerhards/v5-stable-install

V5 stable install
Merge branch 'v5-stable' into v7-stable