add option to gt shredder to include more information

closes #369
rename function
fix wrong strchr usage
typos, comment and help enhancement
Merge pull request #371 from Garonenur/shredder

add option to gt shredder to include more information
remove too strict assertion
Merge pull request #372 from satta/repr_fix

remove too strict assertion
simplify handling of CS/RF lines in HMMER output
Merge pull request #373 from satta/wolfe_ltrdebug

simplify handling of CS/RF lines in HMMER output
support GtGenomeNode methods for non-feature implementations
Merge pull request #375 from satta/all_nodes

support GtGenomeNode methods for non-feature implementations
make sure scores are defined before querying
Merge pull request #378 from satta/scores_defined

make sure scores are defined before querying