applications/luci-statistics: convert nut plugin to minutes

git-svn-id: http://svn.luci.subsignal.org/luci/trunk@9537 ab181a69-ba2e-0410-a84d-ff88ab4c47bc
luci-statistics: don't plot data points where there are no data.

Converting NaN to zero for the sake of the cumulative stack in non-overlay
mode is all very well. But we shouldn't then use that for displaying the
graph. Make another variable %s_plot which *preserves* NaN from the input
data, and then we don't get bogus data points drawn. Especially at the end
of the graph this was problematic.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

git-svn-id: http://svn.luci.subsignal.org/luci/trunk@9538 ab181a69-ba2e-0410-a84d-ff88ab4c47bc
luci-statistics: add transform_rpn option to graphs, use it for nut battery life

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

git-svn-id: http://svn.luci.subsignal.org/luci/trunk@9539 ab181a69-ba2e-0410-a84d-ff88ab4c47bc
luci_statistics: Add y_min, y_max, units_exponent options and clean up some graphs

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

git-svn-id: http://svn.luci.subsignal.org/luci/trunk@9540 ab181a69-ba2e-0410-a84d-ff88ab4c47bc
fix is_installed() check for l2tp

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

git-svn-id: http://svn.luci.subsignal.org/luci/trunk@9541 ab181a69-ba2e-0410-a84d-ff88ab4c47bc
contrib/package: fix typo in luci-app-firewall package description

git-svn-id: http://svn.luci.subsignal.org/luci/trunk@9542 ab181a69-ba2e-0410-a84d-ff88ab4c47bc
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