adif_merge v1.1.0

"Be liberal in what you accept, conservative in what you send."

Major changes to ADIF validation.
* Warn and ignore QSO's missing a mandatory field.
* If an Integer or PositiveInteger is a float, convert it to an int.
* Repair common mode/submode mistakes.
* Use locale sane folding instead of lower() when comparing CNTY fields.
* Add --log-level
* Default to latin-1 file encoding per ADIF spec.