Read ACE format assembly files
These are typically output by sequence assembly tools,
like CAP3 or Phrap.
Documented in the section labelled "ACE FILE FORMAT" at
Briefly: each field is a line starting with a two letter code,
in some cases followed by data lines termintated by a blank line.
-- AS contigs reads
-- CO contig_name bases reads segments compl (CAP3: segments=0)
-- AF read1 compl padded_start_consensus (negatives meaning?)
-- AF read2 ..
-- BS segments
-- RD read1 bases info_items info_tags (latter two set to 0 by CAP3)
-- QA read1 qual_start qual_end align_start align_end
-- DS (phred header? left empty by CAP3)
-- RD read2 ...