Store attributes from GTF
Adds ID, Parent, gene_id, and transcript_id attributes to gene and transcript features
gtlua: add genome_node:change_seqid()
Merge pull request #434 from satta/luaseqid

gtlua: add genome_node:change_seqid()
Merge pull request #433 from standage/gtf-attr

More complete parsing of GTF attributes
do not output cji/cjo/jnc if not required
Merge pull request #435 from ggonnella/fix_readjoiner

do not output cji/cjo/jnc if not required
add gt_typecheck_info_register_options_with_default()
use "so" as default typechecker for speck tool
Merge pull request #437 from satta/speck_defaults

use "so" as the default typechecker for speck tool
improve wording
coding style
add more info to `gt sequniq -help`

See issue #438
Merge pull request #439 from gordon/sequniq

small improvements for `gt sequniq`