Several improvements to price repair

Repair 100x and split errors:
- Handle stocks that recently suspended - use latest ACTIVE trading as baseline
- Improve error identification:
  - Restrict repair to no older than 1 year before oldest split
  - To reduce false positives when checking for multiday split errors,
    only analyse 'Open' and 'Close' and use average change instead of nearest-to-1
  - For weekly intervals reduce threshold to 3x standard deviation (5x was too high),
    and for monthly increase to 6x
  - For multiday intervas, if errors only detected in 1 column then assume false positive => ignore

Repair missing div-adjust:
- Fix repair of multiday intervals containing dividend

Price reconstruction:
- Move to after repairing 100x and split errors, so calibration works properly
- Fix maximum depth and reduce to 1
- Restrict calibration to 'Open' and 'Close', because 'Low' and 'High' can differ significantly between e.g. 1d and day-of-1h

Miscellaneous:
- Deprecate repair='silent', the logging module handles this
- Improve tests for 100x and split errors
- New test for 'repair missing div adjust'

Improve bad-split-repair on multiday intervals
Switch some repair log msgs from warning -> info