More info on weights etc in dedupe rules
Created by: eileenmcnaughton
In looking at https://civicrm.stackexchange.com/questions/31423/deduplicate-by-name-and-surname-or-vice-versa/31425#31425
I realised that https://civicrm.org/blog/spidersilk/understanding-civicrm-dedupe-rules has more info than https://docs.civicrm.org/user/en/latest/common-workflows/deduping-and-merging/
- we should pilfer some