factorize boilerplate in simple filters

Jean-Francois Dockes Jean-Francois Dockes 2018-06-04

added src/filters/rclbasehandler.py
changed src/filters/rclgenxslt.py
changed src/filters/rclimg.py
changed src/filters/rclsoff-flat.py
changed src/filters/rcltext.py
src/filters/rclbasehandler.py Diff Switch to side-by-side view
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src/filters/rclgenxslt.py Diff Switch to side-by-side view
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src/filters/rclimg.py Diff Switch to side-by-side view
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src/filters/rclsoff-flat.py Diff Switch to side-by-side view
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src/filters/rcltext.py Diff Switch to side-by-side view
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