Optimize and fix issues at PIBD cache. #68
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Optimize and fix issues at PIBD cache.
Previous version download process can stuck because late duplicate response was stored forever in cache. When cache size reached 15 elements, download stopped.
Also sync loop had waiting time 10 ms. It is too low, because checking for sync state takes CPU time. Instead we better to use that CPU time to applying requested data. With TOR normal response time 1-3 seconds, that why current sync sleep time is 500ms+500ms = 1 second.