[collectd] collectd2html.pl: write SVG-plots into the XHTML-file

[Timur Kirilichev]

I suggest for collectd2html.pl to write SVG-plots not in separate files 
(as it does at present), but to write them into the XHTML-file.

Benefits:

1) saves the filesystem space;

2) saves in number request to the HTTP-server (all the data are 
transferred in one request to the server);

3) it's easier to copy just one file.

In order to realize it, the command string formation was replaced by the 
command list formation.




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