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py-matplotlib: updated to 2.1.2

2.1.2:
This release fixes a number of critical bugs:
- fix a typo in mlab.cohere which yielded incorrect results
- allow nonposx / nonposy to pass through loglog
- fix color comparisons when finding handles with legend
- fixes a recursive draw bug and a major performance regression in
  Qt5Agg backend
- fix a re-draw bug in WxAgg
- fix image scaling with high-bit depth integers
- revert the busy-cursor

Log message:
py-matplotlib: follow redirect

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py-matplotlib: updated to 2.1.1

2.1.1:
Bug fixes.

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*: depend on py-cairo now it supports all python versions

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For Python 2.7: depend on py-backports.functools_lru_cache instead of py-functools32

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py-matplotlib: update to 2.1.0

v2.1.0:

This is the second minor release in the Matplotlib 2.x series and the first
release with major new features since 1.5.

This release contains approximately 2 years worth of work by 275 contributors
across over 950 pull requests. Highlights from this release include:

* support for string categorical values
* export of animations to interactive javascript widgets
* major overhaul of polar plots
* reproducible output for ps/eps, pdf, and svg backends
* performance improvements in drawing lines and images
* GUIs show a busy cursor while rendering the plot
* along with many other enhancements and bug fixes.

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Added DEPENDS for Python 2.7

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Minor clean-up

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Critical bug fixes in 2.0.2:
- fixed Qt4 support
- fixed LogFormatter
- fixed hatched artists in legends
- fixed segfault with large images

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update URL