* splitting off only start or end of the read, or both; the output will contain
chopped sequences AND corresponding base qualities
* splitting arbitrary number of bases off each end (different numbers
for left and right segments can be specified; segments can overlap)
* splitting only unmapped reads, ignoring mapped ones
* writing splitted ends into separate sam/bam files, or into a single output file
* decorating original read names with user-specified suffixes for each end
(e.g. _1 and _2 for left and right parts of the read); default: no decoration,
original read names are used
* when mapped reads are split, the alignment cigars are chopped appropriately
and the alignment start positions are adjusted (for the right end) to correctly
specify the alignment of the selected part of the read
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