Fix CRC calculation on verify for crc-capable bootloaders - #100
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The calculated CRC accumulator must be reset to 0 after each page. Previously the latest result was retained leading to incorrect crc for all the pages after the first one.
This bug won't lead to a verify error (so it may not be the cause of #96 IMHO), because the page was compared anyway with a direct read if the CRC fails, but it degrades performance due to the slow byte-by-byte comparison.