parse RF lines correctly in hmmscan output
allow visitors without feature node handlers

Closes #346.
Merge pull request #341 from satta/hmmscan_parse_fix

parse RF lines correctly in hmmscan output
Merge pull request #347 from satta/feature_visitor

allow visitors without feature node handlers
Merge branch 'inlineseq' of https://github.com/satta/genometools into inlineseq
intermediate