Add qwtpolar-1.1 embedded copy for Qwt >= 6.1 support

[qgib]

Author Name: Bas Couwenberg (@sebastic)
Original Redmine Issue: 13156
Affected QGIS version: 2.8.2
Redmine category:build/install

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Ubuntu has shipped with Qwt 6.1 since vivid "[1]":https://launchpad.net/ubuntu/+source/qwt, and the Debian maintainers plan to update to Qwt 6.1.2 "[2]":https://tracker.debian.org/pkg/qwt in the near future too.

The embedded copies for qwtpolar-0.1 & qwtpolar-1.0 don't support Qwt > 6.0.0, qwtpolar-1.1 does "[3]":http://sourceforge.net/p/qwtpolar/code/182/log/?path=/trunk/qwtpolar.

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Related issue(s): #16446 (relates)
Redmine related issue(s): 7495

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[qgib]

Author Name: Jürgen Fischer (@jef-n)

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vivid also ships Qwt 5.2 (see http://dash.orfeo-toolbox.org/buildSummary.php?buildid=195327). That what the vivid nightlies use.

[qgib]

Author Name: Bas Couwenberg (@sebastic)

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Debian has transitioned to Qwt 6.1 and the Ubuntu release after xenial is likely to follow.

The Qwt 6.1 packages are required for Qt5 support.

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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Fixed in a9cb990 (and c3881d4)

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• resolution was changed from to fixed/implemented
• status_id was changed from Open to Closed