Gff3tool

This release contains the following changes:

- added a new program, gff3_fix.py, which can automatically fix 30 error types detected by gff3_QC.py
- gff3_QC.py: added a new argument, noncanonical_gene, to accommodate non-canonical gene models in the GFF3toolkit workflow
- gff3_merge.py:
- modified to accommodate non-canonical gene models in the GFF3toolkit workflow. Includes new arguments user_defined_file1 and user_defined file2
- several other fixes

This version contains:

- Updated program names
- Updated arguments to individual programs
- gff3_QC.py - new argument -i allows you to specify whether the initial CDS phase should be checked
- gff3_to_fasta.py - new option that allows advanced users to specify their own sequence type via parent and child features
- multiple bug fixes

This is the initial release of the GFF3toolkit.