[Xymon] Graph patch

Hi,

I added option filter and filelist to showgraph.sh to enhance the graphing availabilities. The filter filters the rrd files and only graphs the matching files. With file filelist option, you can specify a list of rrd files. | is used between the files.

Example, if you have file system /home and /home/users, you can add filter=,home to filter for filesystems containing /home at the end of the showgraph.sh url. Or you can add ,home|,home,users to only show /home and /home/users.

I think this is a nice feature for Xymon.

But I need some help.... The only issue I have is that for filter it works fine, but for filelist, the graphs are missing the filenames in the comments.

Stef