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
implement a ruler_offset property for ann.sketch
implement ruler_nozeropos property for sketch
add a test case for the new ruler properties
change default value for ruler_nozeropos
Merge pull request #383 from ggonnella/ruler_offset

Generation of images for transcripts