added options_required_single method
added remove_adaptor command
removed old documentation from remove_adaptor
renamed remove_adaptor to clip_primer
clip_primer command in place
reset bad change in options_assert method
removed checks on seq_name and seq presence in Seq#to_bp method
fixed forward search distance in clip_primer
removed redundant tests on seq and seq_name presence
finished code for clip_primer
finishied forward direction tests for clip_primer
fixed resetting seq_len in to_bp method
finished tests for clip_primer
finished documentation for clip_primer