Changes
- Added more output for detecting frequency from timeseries index (`core.times.times.DetectFrequency`)
- The associated functions have been updated accordingly: `core.times.times.timestamp_infer_freq_from_fullset`,
`core.times.times.timestamp_infer_freq_progressively`, `core.times.times.timestamp_infer_freq_from_timedelta`
- Added new notebook (`notebooks/TimeStamps/Detect_time_resolution.ipynb` )
- Added new unittest (`tests/test_timestamps.py`)