Better handling for svyglm models and fix for #39#41

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tzoltak wants to merge 6 commits intoleeper:masterfrom

Commits on Jun 17, 2019

find_data correctly supports svyglm models
tzoltak
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Commits on Aug 7, 2019

find_data() methods for survey design objects
tzoltak
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prediction.svyglm() deals with (new) data that conatins NAs
tzoltak
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build_datalist() preserves levels of factors that are mentioned in `at`
tzoltak
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prediction.svyglm() deals with `data` being survey design object
tzoltak
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test for updates in prediction.svyglm
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