Fixes for some issues#183

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mb706 wants to merge 11 commits intomlr-org:mainfrom

mb706:mb706_fixes

Commits on Jun 25, 2017

Fix printing of discretevectorparam with length 0 default
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make 'tunable' uniform
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Adding makeCharacterLearnerParam
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roxygenize
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Forgot name change when copy-pasting
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Commits on Jul 25, 2017

Print 'list()' as default value for empty list
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