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
stop splint warning
Merge pull request #380 from Garonenur/dw

stop splint warning
check for inconsistent strands in GTF parser
fix memleak
Merge pull request #381 from satta/gtf_debug

check for inconsistent strands in GTF parser