Add support for multiple types db
Add LVM plugin
add percentile support to network traffic graphs

Set $CONFIG['percentile'] to a number and a XXth percentile line + legend
will be added to all network traffic (if_octets) graphs.

Closes #81
Merge remote-tracking branch 'feandil/for_upstream_lvm'
Merge remote-tracking branch 'dhchen/master'
type/base: replace array_merge by + sign to merge a fallback array

array_merge resets the index, while in case of $this->colors and
$this->legend, we'd like to keep the index. An irq plugin sample:
array(1 => 1, 'ERR' => 'ERR') must not become
array(0 => 1, 'ERR' => 'ERR') after an array_merge.
Keep the list of plugins sorted
Use config time_range for canvas graphs
Merge remote-tracking branch 'feandil/time_range'
rm plugin.php

Forgotten in commit:
v0.3-77-gbf56a64 [remove ajax js code]
jsrrdgraph: Fix errors in second axis.
jsrrdgraph: Fix graph width to look like rrdtool.
Escape HTML in GET-provided hostname

A malicious user can enter javascript code in "h" GET parameter and this
code gets executed because this parameter is copied in the HTML output
without any escaping.  This patch escape the output before it is checked
it is valid.
type/genericio: apply percentile on scaled value
jsrrdgraph: RrdGraph.js: make HRULE support reference to variable

The value of HRULE could be a reference to for example a VDEF variable.

Closes #85
type/default: optionally draw min/max spikes in a lighter color in graphs

Closes #73
Add an 'ignore' graph type
New plugin: turbostat

(Edited from  Nicolas Iooss <nicolas.iooss_git@polytechnique.org>)