Added auto-retarget logic for high remainder difficulty blocks.
Added faster ProbablePrimeChain test. Analysis indicated that testing for a chain at the end of the intended chain rejected more candidates with less prime tests needed. In 4 million tests, this should reject an extra ~200k candidates on first test versus standard implementation. After the second test, the fast implementation will have rejected ~25k candidates compared to the first two standard tests. This renders 4ch/5ch stats "useless" as we drop them before validating the chain. Minor tweak to sieve to skip unnecessary prime tests on primes less than that used in HeaderHashPrimorial.
Added Release-XP configuration for older x64 systems.
Removed /AVX from Debug|x64 build configuration.
Minor tweak to ProcessMultiplier to use an easily incremented pointer for nVariableMultipler position in memory instead of calculating position each time.
Fixed bug with Primorial decreasing below 2 when client is disconnected from pool.
Manually merged HP10 changes from Mumus dev branch.