Setting SYNCEVOLUTION_PBAP_CHUNK_TRANSFER_TIME to value <= 0 is not
working like described in README file - according to it, it should turn it off,
which in my understanding should disable tuning of chunks size and use constant
value for each transfer (equal either to
SYNCEVOLUTION_PBAP_CHUNK_MAX_COUNT_PHOTO or
SYNCEVOLUTION_PBAP_CHUNK_MAX_COUNT_NO_PHOTO).
Currently in such case chunk size is modified and is decreasing very quickly
until reaching 0, which causes synchronization finish without downloading all
contacts and without returning any error.