IAMconsortium / pyam / 689

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Initialize an `IamDataFrame` from `pd.DataFrame` with formatting specs (#199)

* initial impl for giving default pyam dataframes

* move again into core

* small fixes

* update concat to try to cast to dataframe

* appease stickler

* fix `TypeError` in `concat()`

* add `concat_with_pipe()` in `utils` with some tests

* cast elements in `concat_with_pipe()` to `str`

* drop `nan` instead of casting to `str`

* insert function `reduce_hierarchy()` and add tests

* raise error if initializing `IamDataFrame`with duplicate rows in `data`

* remove unused legacy function

* add auxiliary function `sort_data()` for consistent ordering of cols

* use `sort_data()` in `append()`

* add `sort_data()` to some unit tests to make them pass

* refactor and add first test for `df_to_pyam()`

* clean-up before stickler gives me an earful...

* clean-up of implementation of `df_to_pyam()`

* update docstrings

* allow input-df with columns `year` and `time`

* defining `defaults` doesn't seem to be necessary

* require `value` arg in `df_to_pyam()` instead of using all columns

* check for conflicts with existing columns, add test

* add option in `df_to_pyam()` to rename cols

* add feature to concat required column from multiple given columns

* make `cast_to_iam` partof `format_data()`

* rename function to `read_file()` because it can only read one file

* pass kwargs for `format_data` through `read_file()`

* pep8 and docstring cleanup

* add to release notes

* minor edits as requested by @gidden in the review

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