Add a ignore_unknown node-level directive, allowing to selectively ignore unknown values when running munin-limits.
Also ignore transitions from UNKNOWN to OK.
Don't bail out, just prevent the state from changing.
plugins: fix typo (Muning::Plugin::HTTP)
master: do not use -p $port if unset in ssh url

If the port part is not specified in the address url, we should not
substitute it to 22.

This enables the choice to be made in /etc/ssh/ssh_config
master: adding translucent AREA+STACK
travis: adding perl 5.18
travis: build the master branch
node/t: adding some time to the test

Perl 5.18 takes longer than previous versions
doc: Digest::SHA1 has been replaced by Digest::SHA in perl core 5.9.3
munin-update with max_processes=1 is the serial option

... while max_processes=0 does what it says - and spins with 100% cpu doing nothing.
node: added --servicedir switch to munin-node

This code is copied over from munin-node-config, that already does the same
node: untaint the service-dir args
Clean field names

Non-clean field names cause problems with drawing, e.g. when there are spaces
or dashes in the process name. This commit cleans the field name by using the
appropriate support module. For more information, see:

http://munin-monitoring.org/wiki/notes_on_datasource_names
Added documentation for 'Clean field names'
Clean procargs and procuser as well

Github user @leeclemens reported that procargs should be cleaned as well and
rightly so. I took this opportunity to clean procuser as well, since usernames
could have periods (even though people should probably avoid that, if possible).

Tested procargs with 'python example.py', this gave expected results.
Allow spaces int he mount point in the plugin 'df'
fix irqstats
Remove unrecognised symbols from "$procuniq" 

Didn't research why exactly have lot of errors in log files and can't draw images, but removing some symbols (minuses, dots, slashes,... probably need to populate list) in "procuniq" internal variable removes the problems.
procuniq - remove symbols which is not a-zA-Z0-9_ 

common solution for the problem