add emphasis to note sections
add git to required packages
add info on using the librenms vm
Add contributing guidelines
Add Observium users welcome
Update README

- Add Observium users welcome
- Add contributing guidelines
- Tidy links
Update CONTRIBUTING.md

Encourage the use of 4-digit issue ids
Update Observium_Welcome.md

Correct revision number
add framework for new cron features; add ability to update librenms daily
update install docs to include notice about daily updates
Another update to my stupid grep script
Removed cruft
Remove user-facing references to Observium

This eliminates nearly all of the user-facing references to Observium,
including in the names of temporary files and in the metadata of PDFs.  Many
of these may not be used any more, but I've adjusted them anyway.  These
changes should also make it easier to change the branding later if it is
needed.  There are a few references of which I still don't understand the
significance, so I've left them as-is for now.  The Unix agent in particular
is rather untidy.
Merge branch 'master' into devel
Menubar fix attempt #1
Menubar fix attempt #2
Menubar fix attempt #3
Menubar fix attempt #4
Menubar fix attempt #5
Menubar fix attempt #5