Plastid 0.6.1 causes BAM2coconcount.py to exit with an error

[lparsons]

Plastid 0.6.1 changed the Transcript object. It does not appear to have a method get_length anymore.

Quick fix is to pin the Plastid version in the workflow.

Longer term fix is to update the code to work with the newer Plastid API.

INFO: Evaluated 1 genes
Traceback (most recent call last):
 File "code/BAM2codoncount.py", line 210, in <module>
   main(args, loglevel)
 File "code/BAM2codoncount.py", line 70, in main
   if (transcript.get_cds().get_length() <= 0):
AttributeError: 'plastid.genomics.roitools.Transcript' object has no attribute ‘get_length'