Robotsuite

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- Fix issue where test suites with sub-suites were not supported
[datakurre]

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- Fix issue where suite setups were run for suites without tests
wit robotframework >= 2.8.0
[datakurre]

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- Fix regression in 1.4.0, which dropped relative path names from robot test
cases
[datakurre]
- Fix RobotTestCase to mimic DocTestCase enough to allow plone.testing to set
'layer' for it
[datakurre]
- Fix to set given test 'setUp' and 'tearDown' methods properly as
instancemethods (will break existing methods not accepting 'self' parameters)
[datakurre]

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- Supports only roboframework >= 2.8.
Use robotsuite 1.3.x with robotframework 1.7.x
[datakurre]

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- Fix to support custom screenshot filenames with paths [fix 2]
[datakurre]

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- Remove screenshot capturing from functional test
[datakurre]