Add QSO::completeWith() for merging duplicate QSO records

[Copilot]

Implements QSO::completeWith(const QSO& q2) to fill empty fields from another QSO without overwriting existing values. Enables merging duplicate QSO records during import and LoTW synchronization.

Changes

Core Implementation

• Added bool completeWith(const QSO& q2) to QSO class
• Checks all ~120 ADIF fields against their empty values (empty strings, -1 for ints, invalid dates, etc.)
• Fills only empty fields from q2, preserving all existing values in calling QSO

Frequency Handling

• Creates temporary copies to call non-const Frequency::isValid() on const references
• Uses direct assignment (consistent with copy() method) since setters accept doubles, not Frequency objects

Test Coverage

• Four test cases: basic completion, empty QSO fill, numeric fields, date fields
• Updated test CMakeLists.txt with missing qsodatacache.cpp dependency

Incidental Fixes

• Fixed syntax errors in database.cpp (lines 83, 1653) preventing compilation

Example Usage

QSO qso1, qso2;

// qso1 has partial data
qso1.setCall("EA4K");
qso1.setBand("20M");
qso1.setRSTTX("59");

// qso2 has overlapping and additional data
qso2.setCall("EA4K");       // Same
qso2.setBand("40M");        // Different - will NOT overwrite
qso2.setRSTRX("58");        // Missing in qso1 - will fill
qso2.setGridSquare("IN80"); // Missing in qso1 - will fill

qso1.completeWith(qso2);

// Result: qso1.getBand() == "20M" (preserved)
//         qso1.getRSTRX() == "58" (filled)
//         qso1.getGridSquare() == "IN80" (filled)

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Create QSO::completeWith(const QSO & q2)</issue_title>
<issue_description>The qso should read all the values of the argument q2 and complete if the calling qso has empty values.
If the calling qso has a value in a variable and q2 too, q2 value is never overwriting the value of the calling qso.

Note: This will be valuable for import and lotw ... when a qso is duplicated</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create QSO::completeWith(const QSO & q2) #854

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