Dcicwrangling

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* Bug fix in notebook 04: expsets were not unique in publication.

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* Bug fix in notebook 04: ``exp_sheet`` was missing.
* Up to 5 channels are supported now.

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* Small improvements in the notebook to replace uploaded files, adding
extra_files and improving the search query and variable names.
* Bug fix: some "empty" cells were not handled correctly.

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* Fix a bug in status level for UserContent items.

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* Added new notebook to replace uploaded files and delete linked items.

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`PR 90: Geo2fdn update <https://github.com/4dn-dcic/dcicwrangling/pull/90>`_

* Uses openpyxl in geo2fdn script - now this script handles ``xlsx`` files.
This is compatible with files produced by Submit4dn v2.2.0 and up.
``xls`` files are not supported anymore.
* Remove xlrd, xlwt, xlutils dependencies in the entire repo, as this script was
the only remaining one to be upgraded to use openpyxl.
This could be a breaking change in case of untracked scripts/notebooks.
* Bug fix in geo2fdn script: FileFastq tab is now written properly.