easily identify forks whilst waiting on open of fifo
Temporary reversion of bammarkduplicates2 to bammarkduplicates

until biobambam release including gt1/biobambam@af537702d163669fdd5ed32089ca2a0ecb634760
Merge pull request #17 from dkj/devel

bammarkduplicates revert & easily identify forks whilst waiting on open of fifo