Log Message:
update to 1.13
changes:
* Graphs are rendered in separate threads for speed and a responsive
  user interface
* A changed Graph is rendered immediately on document modification,
  improving latency
* A new ternary plot widget is included
* Size of pages can be modified individually in a document
* Binary data import added
* NPY/NPZ numpy data import added
* Axis and tick labels on axes can be rotated at 45 deg intervals
* Labels can be plotted next to points on non-orthogonal plots
* Add an option for DPI of output EPS and PDF files* Graphs are rendered
  in separate threads for speed and a responsive user interface
* A changed Graph is rendered immediately on document modification,
  improving latency
* A new ternary plot widget is included
* Size of pages can be modified individually in a document
* Binary data import added
* NPY/NPZ numpy data import added
* Axis and tick labels on axes can be rotated at 45 deg intervals
* Labels can be plotted next to points on non-orthogonal plots
* Add an option for DPI of output EPS and PDF files
-more minor changes
-bugfixes