Update of rrdtool to 1.2.9:

Major Changes between 1.0.x and 1.2.x

Graphing
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* rewritten graphics generation based on libart.
  - anti-aliased output
  - alpha transparency support
  - truetype fonts

* additional graphics formats: EPS, PDF, SVG

* extended multi-part documentation

* VDEF support; define and use variables.  Find, and use, the
   maximum rate seen by rrdtool; compute and show the average

* Sliding window (trend) analysis
  Compute a smoother average, for instance over the last 6 CDPs

* percentile (95th or other)
  Remove peaks, 95 percent of all rates are at or below the returned value

Logging
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* a second logging interface: rrdtool updatev
  Verbose updating of the database; show CPDs being created

* Aberrant Behavior Detection with Holt-Winters Forecasting
  Compare current data with expected data, detect and log when
  the rates are outside expected levels

* COMPUTE data type for artificial data-sources calculating their
  input using RPN math and data from the other data-sources.

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