Autocombine Reward Backward Compatibility issue

[CaveSpectre11]

This applies to the code added for next release.

Those with an autocombinereward record in their wallet, will get a wallet.dat corruption error on startup. This needs to be handled.

PIVX-Project/PIVX#873

bool getAutocombineSettings()
{
    bool fAutocombineException = false;

    try {
        std::pair<std::pair<bool, CAmount>,int> pSettings;
        ssValue >> pSettings;
        pwallet->fCombineDust = pSettings.first.first;
        pwallet->nAutoCombineThreshold = pSettings.first.second;
        pwallet->nAutoCombineBlockFrequency = pSettings.second;
    } catch (...) {
        fAutocombineException = true;
    }

    if (fAutocombineException) {
        try {
            pwallet->fCombineDust = pSettings.first;
            pwallet->nAutoCombineThreshold = pSettings.second;
            pwallet->nAutoCombineBlockFrequency = 15;  // interpret for new functionality
            // include notification to user in an attempt to get them to redo their autocombinereward 
        } catch (...) {
            return false;
        }
    }
    return true;
}

[CaveSpectre11]

Fixed with 63883e4

Had to go a little different then originally designed. Anyone using autocombine with the current versions of the alpha testing will need to re-issue their autocombinerewards settings, as they will likely get wallet.dat load issues (non critical) until they do. This was more desirable then having regular users, not involved in the alpha testing, having these issues.