Pdfstream

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**Fixed:**

* Fix the bug that the background subtraction and dark substrate do not work in the integration

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**Added:**

* The XPD server will publish the data to a proxy

**Changed:**

* The section name of the configuration of XPD server is changed.

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**Added:**

* The base objects to process data from bluesky runs.

* The objects to process the XRD data to PDF data from bluesky runs.

* The functions to replay the analysis.

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**Added:**

* Make callback safe for the Exporter and Visualizer in the XPDRouter.

* Add a DataFrameExporter to export data in dataframe

* Make calibration callback identify special calibrant name 'Ni_calib'

**Changed:**

* Export 1d array in dataframe data instead of the numpy array

* Optimize the layout of figures for visualization callbacks

**Fixed:**

* Fix the bugs of xpd server when it is used with xpdacq.

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**Fixed:**

* Fix the bug that pdfstream has import error if the diffpy.pdfgetx is not in environment

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**Added:**

* `databroker`, `bluesky` are added in the dependencies

* A server to process the streaming x-ray diffraction data to PDF

* A server to decompose processed PDF to a linear combination of other PDFs

* The functions to query the necessary data from the databroker

**Changed:**

* Starting from 0.3.0, the package will be released on `nsls2forge` channel on conda.