revised the option handling, added -o<OFFSET> and -r<PRE_SIEVE> options
revised the option handling, added -o<OFFSET> and -r<PRE_SIEVE> options

fredwang00/primesieve,anatoliyrazin/primesieve,ZahidDev/primesieve,ZahidDev/primesieve,tempbottle/primesieve,tempbottle/primesieve,kimwalisch/primesieve,anatoliyrazin/primesieve,fredwang00/primesieve,fredwang00/primesieve,ZahidDev/primesieve,anatoliyrazin/primesieve,kimwalisch/primesieve,tempbottle/primesieve,kimwalisch/primesieve