Quick fixes, change some methods to be static
Add probe state to the INFO message logged/viewed when no changes were done
Squash some code style warnings
Allow finding probes by state (enabled/disabled)
Don't fetch probes from the API before we have verified CLI args
Use logical AND for search arguments instead of logical OR

OR doesn't really make sense because one could do e.g. « --get-tags test --get-state disabled » and get probes tagged 'test' in addition to 'disabled' ones not tagged 'test'.

The new mode of operation is to only accept 'disabled' probes that are also tagged 'test'. This works for all --get-* arguments, except for « --get-probes all » or « --get-tags all », which will still accept all available probes.