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Previously, a command is built by string concatenation. Here, the
distinction between a value and multiple params got lost. Solve this
by using an array for shell arguments. As the escaping is now removed
from the `rrd_gen_graph` function, the canvas style needs to manually
add those quotes to make the JS code still work. That only supports
double-quotes, so hopefully nobody creates a name with a double quote
as that would break the fragile JS command line parser.
Separate the rrdtool options from the rrdtool graph command to make the
`$graph_type == 'canvas'` option work (it would otherwise not understand
the `rrdtool graph - -a PNG` option).
Merge the SVG and PNG cases as they are the same except for the
Content-Type header.
Fix a missing html escape in a debug style.
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