Release 3.52.0

[jkotan]

In the v3.52.0 release

• --keywords to nxsfileinfo metadata added (#529)
• --raw to nxsfileinfo groupmetadata added (#529)
• append_scicat_record helper command to scdataset.py added (#529)
• typos in nxsfileinfo groupmetadata fixed (#529)
• merge lists in groupmetadata added (#530)

[jkotan]

The debian and ubuntu packages are in the HDRI repository.