Merge pull request #172 from bobleesj/dobject-depre

Deprecate `Diffraction_object`, rename to `DiffractionObject` (new clean PR)

Author: sbillinge

news/deprecate.rst

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+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* Diffraction_object class, renamed to DiffractionObject
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>