system/dstat: Initial import

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+Dstat is a versatile replacement for vmstat, iostat, netstat, nfsstat and
+ifstat. Dstat overcomes some of their limitations and adds some extra features,
+more counters and flexibility. Dstat is handy for monitoring systems during
+performance tuning tests, benchmarks or troubleshooting.
+
+Dstat allows you to view all of your system resources instantly, you can eg.
+compare disk usage in combination with interrupts from your IDE controller, or
+compare the network bandwidth numbers directly with the disk throughput (in
+the same interval).
+
+Dstat gives you detailed selective information in columns and clearly indicates
+in what magnitude and unit the output is displayed. Less confusion, less
+mistakes.
+
+Dstat is unique in letting you aggregate block device throughput for a certain
+diskset or networkset, ie. you can see the throughput for all the block devices
+that make up a single filesystem or storage system.
+
+You can write your own dstat plugins to monitor whatever you like in just a few
+minutes based on provided examples and a little bit of Python knowledge.
+
+Dstat's output by default is designed for being interpreted by humans in
+real-time, however the new CSV output allows you to store CSV output in detail
+to a file to be imported later into Gnumeric or Excel to generate graphs.