ADIF import fails if QTH is larger than 64 chars.

[john-terrell]

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Describe the bug
When importing an ADIF file where a QTH field has more than 64 characters, the import stops and fails with an error message. The ADIF spec says the QTH field is a regular string without a fixed length (that I could find in the spec). Some QTH's I've received have more than 100 characters. Looking at the database SQL, the COL_QTH field is restricted to 64 characters (either input should be trimmed to fit or the field should be changed to a non-length limited string type).

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