Copy on write using weakrefs (part 2)#12036

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nickeubank wants to merge 14 commits intopandas-dev:masterfrom

nickeubank:copy_on_write

Commits on Jan 13, 2016

first pass at fixing
Nick Eubank
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fixed iloc issue
Nick Eubank
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works except for settingoncopy warning, which is now broken
Nick Eubank
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Basic working implementation
Nick Eubank
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now keeps columns as views
Nick Eubank
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check for dead weakrefs
Nick Eubank
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store children in weakValueDictionary instead of list
Nick Eubank
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Remove redundant copying
Nick Eubank
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Add back reference to origin df to protect against broken chains of views
Nick Eubank
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make _is_view more conservative on multi-block objects
Nick Eubank
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fix multi-index behavior
Nick Eubank
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fix test_merge
Nick Eubank
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update add_to_child to register_new_child
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modify dataframe constructor
Nick Eubank
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