Description :
When XDEM performs a Blockwise coregistration, the output DataFrame xdem.coreg.BlockwiseCoreg.stats() contains : inliers, x-y-z_offset,  x-y-z_center, median and nmad of elevation differences after coregistration. We would like to add more statistics to the DataFrame.
New statistics and values for each subdivision :
General :
- Row number
- Column number
- Percentage of valid points
- Number of pixels
For the elevation differences after coregistration :
- Mean
- Maximum
- Minimum
- Standard deviation
- Root mean squared error
- 90th percentile
- Sum
- Sum squared