Reimplement nagios formula

The nagios-formula as it was used before made a number of Arch specific choices and also didn't allow the user to tailor the configuration of the various services sufficiently to their needs.

I am working on reimplementing the nagios formula and want to share my work with the community. This work is not done and, in particular, states for the nagios server itself need to be implemented properly. I do, however, believe that the formula as I have it now is more useful to users and would therefore appreciate it if you could accept this contribution.

It should be pointed out that some breaking changes were necessary.