Further fixes to min/max handling and quotes in names#1833

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dolfs wants to merge 4 commits intoshinken-solutions:masterfrom

dolfs:percent_min_max

Commits on Mar 27, 2016

Fixed omission of min or max from graphs if set to 0
Dolf Starreveld
committed
Fixed for pep8 complaints
Dolf Starreveld
committed

Commits on Mar 29, 2016

Fix handling of min and max values for percentages
Dolf Starreveld
committed
Various fixes in perfdata handling
Dolf Starreveld
committed