Pdfstream

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**Changed:**

* Starting from 0.2.2, the package will be released on `diffpy` channel on conda.

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**Added:**

* `integrate` allows user to supply their own mask

* Add `transform` cli, a simple interface to transform the .chi file to PDF.

* Tutorials for users to use the tools in `pdfstream`.

* `integrate` and `transform` will create the output folder if it does not exists.

**Changed:**

* `load_data` is vended from diffpy. `load_array` accepts `min_rows` and key word arguments.

* `write_out` is renamed to `write_pdfgetter`.

* All the code using `diffpy.pdfgetx` is in the transformation subpackage. Users can choose whether to install the diffpy.pdfgetx.

**Removed:**

* IMPORTANT: modeling, parsers, calibration sub-packages are removed.

* IMPORTANT: remove the dependency on xpdtools

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**Added:**

* Set values and bounds for the variables in the recipe.

**Fixed:**

* Fix the bug that mask is not applied to image in the integration.

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**Added:**

* Add the ``parsers`` that parses the information in FitRecipe to mongo-friendly dictionary.

* Add options in ``multi_phase`` that users can set what parameters they would like to refine.

* Add the function ``create`` to create a recipe based on the data and model.

* Add the function ``initialize`` to populate recipe with variables. Users can choose differnet modes of constraints.

* Add examples for the modeling.

**Changed:**

* CLI ``visualize`` takes list argument ``legends`` instead of string ``legend``. Users can use legends for multiple curves.

**Removed:**

* Remove the codes not frequently used.

**Fixed:**

* Fix bugs in the modeling.

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