Update PeakPo

We update PeakPo occasionally (or quite frequently particularly during Shim group's synchrotron beamtime). Update is very simple. You only have to do the following.

1. Download the zip file from either the GitHub repo or the GitHub releases. While the former may contain a version with newer features, they can be unstable. The latter would provide more stable versions.

2. Unzip the file and then and overwrite the existing PeakPo folder.

If you want to keep multiples of different versions of PeakPo in your hard drive (which is in fact recommended), you may use different folder name, such as PeakPo-v7.6.2.