[ENH] Schema updates
Alterations to db schema:
borehole:
- depth -> deleted
- bedrockdepth -> bedrockaltitude (in line with other depth-> altitude
- changes)
- name -> added (based on earlier request from Philipp)
- description -> added (based on earlier request from Philipp)
borehole section:
- topdepth -> topaltitude
- bottomdepth -> topaltitude
- measureddepth (added) description already exists for borehole section.
tests and serialization have been updated based on this.