Feat
- **spt**: add ability to get a simple descriptive report (74)
- **spt**: add ability to check if any sample is hammer weight (73)
- **spt**: add ability to check if any sample is a refusal (72)
- **spt**: add ability to get the seating penetration of each layer (70)
- **spt**: add ability to get the main penetration of each layer (69)
- **spt**: add ability to get the total drive of each layer (68)
- **spt**: add ability to get the N-value of each layer (67)
- **spt**: add ability to get the main drive of each layer (65)
- **spt**: add ability to get the seating drive of each layer (62)
- **spt**: add ability to get the total penetration of each layer (61)
- **spt**: add spt subaccessor (60)
- **in-situ**: add in-situ subaccessor (59)
- **point**: add property that lists unique point IDs (45)
- **layer**: add layer subaccessor (43)
- **utils**: add sub-accessor object for auto-documentation (34)
- **accessor**: register geotech accessor on package import (33)
- **accessor**: register dataframe accessor as geotech (15)
- **point**: add ability to split layers (13)
- **point**: add ability to get thickness of depth values (12)
- **point**: add ability to get center depth values (11)
- **point**: add ability to get top depth values (9)
- **point**: add ability to get group from point groups (8)
- **point**: add point dataframe accessor (7)
- **base**: add automatic validation on init (6)
- **base**: add duplicate validation (5)
- **base**: add monotony validation (4)
- **base**: add column name validation (3)
- **base**: add base class (2)