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**Added:**
* unit tests for initializing DiffractionObject with empty array in xarray and yarray
* function to return the index of the closest value to the specified value in an array.
* functions to convert between d and q
* catch division by zero warning messages in tests
* functionality to raise useful warning and error messages during angular conversion between two theta and q
* Improved API documentation in `DiffractionObject` methods and properties using the NumPy docstring format and PEP 256
* validate xtype belongs to XQUANTITIES during DiffractionObject init
* Group's Pytest practices for using pytest.mark.parametrize in test_diffraction_objects.py
* unit tests for __add__ operation for DiffractionObject
* Better wording on the capture user info functionality
* Spelling check via Codespell in pre-commit
* prettier pre-commit hook for automatic linting of .yml, .json, and .md files
* Function that can be used to compute muD (absorption coefficient) from a file containing an absorption profile from a line-scan through the sample
* sbillinge username as the authorized admin for GitHub release workflow in `build-wheel-release-upload.yml`
* function to compute x-ray attenuation coefficient (mu) using XrayDB
* class docstring for `DiffractionObject`
* docforamtter in pre-commit for automatic formatting of docstrings to PEP 257
* Function nsinterp for automatic interpolation onto the Nyquist-Shannon grid.
* functionality to return the 2D array based on the specified xtype
* functionality in dump to allow writing data on dspace
* addition, multiplication, subtraction, and division operators between two DiffractionObject instances or a scalar value with another DiffractionObject for modifying yarray (intensity) values.
* functionality to rescale diffraction objects, placing one on top of another at a specified point
* new feature in `scale_to()`: default scaling is based on the max q-value in each diffraction object.
* functions to convert between d and tth
* unit test for expected warning when no wavelength is provided for DiffractionObject init
* copy() method for DiffractionObject instance
* docstrings for `on_q`, `on_tth`, `on_d`, and `dump` in `diffraction_objects.py`.
* prevent direct modification of `all_arrays` using `property`
* Information on how to update the default user information
* Example docs for basic DiffractionObject usage
* deploy github pages documentation on pre-release
* Gettable `id` property to `DiffractionObject`
**Changed:**
* Refactor get_user_info to separate the tasks of getting the info from config files and creating config files when they are missing.
* test comment format with compact style without extra line for each comment
* Rename `input_scattering_quantity` to `input_data` in `DiffractionObject` init
* refactor `q_to_tth()` and `tth_to_q()` into `diffpy.utils.transforms` to make them available outside DiffractionObject
* Moved resampler out of parsers, new path is diffpy.utils.resampler
* Rename the `isfloat` function to `is_number`, and move it to the `diffpy/utils/utilsvalidators.py` directory
* arrays and attributes now can be inserted when a DiffractionObject is instantiated
* data are now stored as a (len(x),4) numpy array with intensity in column 0, the q, then tth, then d
* `DiffractionObject.on_q`, `...on_tth` and `...on_d` are now methods and called as `DiffractionObject.on_q()` etc.`
* \tests directory tree to match \src
* DiffractionObject's "id" property renamed to "uuid"
* `DiffractionObject` requires 3 input parameters of `xarray`, `yarray`, `xtype`, to be instantiated. It can be instantiated with empty arrays.
* Paths in our documentation reflect changes made in code.
* Enumerated list for the different ways to set user information
**Deprecated:**
* `resample` function in resampler. Replaced with `wsinterp` with better functionality.
* Diffraction_object class, renamed to DiffractionObject
**Fixed:**
* additional information to users to relieve frustration in finding how to update global config
* Unittest to Pytest migration for test_loaddata.py
* file paths of the test files according to new \tests directory tree
* Typo for get_package_info example
* return type of `get_array_index` method in `DiffractionObject` to return integer instead of list
**Removed:**
* scattering_objects layer in importing diffraction_objects
* `user_config.py`. Replaced by `_load_config` and `check_and_build_global_config` in `tools.py`.
* Relative imports in parser's __init__.py
* `set_angles_from_list`, `set_angles_from`, `set_qs_from_range` methods in `DiffractionObject`