Version number.
Added a buffer-copy function.
Fix in merge:
  - merge based on positions, not qualities
  - merge remaining reads in the spread reads file when the chromosome file is empty, but we did not switch to the next chromosome yet in the spread reads file
Typo.
Merge branch 'master' into sbcl-port-merge

Conflicts:
	buffer.lisp
	elprep-utils.lisp
	user-interface.lisp