Update 0.10.1 release notes

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PIG-3106: Missing license header in several java file

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Update document version to 0.10.1

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Cleanup CHANGES.txt

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Update 0.10.1 release notes

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Revert pig.version in build.xml to 0.10.1

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PIG-3107: bin and autocomplete are missing in src release (daijy)

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PIG-3107:  bin and autocomplete are missing in src release (PIG-3107-2.patch)

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