Features
- Adds a class to load He histogram files
- Adds tests for searching, fetching, and loading.
- Adds a method to save the dataset into netcdf file.
- Adds a method to resample the data when loading them.
Major Changes
- The time and energy arrays are defined from the start of interva so they have have been moved to the center of the interval.
Minor Changes
- Improves the SIS class structure.
Bug Fixes
- Fixes an error where the time and energy arrays are defined from the start of interval.