nextgenusfs/amptk: AMPtk v1.3.0

This is a major reorganization of the code so it is "properly packaged" and can be installed with pip and hopefully conda. After v1.2.4 there were apparently changes to conda that would not allow the scripts to build with the previous code organization. I've then also fixed a few of the bugs that have shown up more recently, including:

• The py2 error in the bold2amptk.py accessory script https://github.com/nextgenusfs/amptk/issues/40
• the edlib version bug reported several times after edlib updated how it stores the version info https://github.com/nextgenusfs/amptk/issues/46