v0.3.15

Improved error checking of QC processing
Improved seq direction deduction in data loading without datasheet
Bug fixes when loading without datasheet
Improved stability of UniFrac tree creation
Improved javascript output
Functionality to use datasheet to modify meta information of samples
Checks for correct version of Mothur being used
Enable negating square root transformation in distance calculations
Updated refSeqDB.fa and symClade.fa
Update Django from 2.2.4 to 3.0.2 (security update)