dwgsim.0.1.12

• produces an error if the insert size is too small for the provided read lengths
• deletions were always being report as homozygous; should only affect the output VCF's AF field.
• insertions were inserted into the reads one base too early relative to the stated genomic location.
• "long" insertions on the forward strand were not inserted into the correct location in the read.
• read names no longer collide when producing a large number of reads.
• fix the error message when giving a wrong value for -z.
• correctly parse negative numbers on the command line.
• corrected the output description of dwgsim_eval
• various compile fixups