Resolves issue #1398

This issue is incorrectly titled - the G-test error occurs here. In short, this PR removes the abilit to use group_significance.py on a table which is relative abundance.
Resolves forum users concern

Forum posts frequently cite the warning that table has no metadata as an error when using group_significance.py. It actually does not cause failures, just a warning. This clarifies the message.
Missing word.
Fixes #1546
Fixes #1547.
Remove cogent.parse.blast.BlastResult in favor of teh brokit
Replace MinimialBlatParser9 import with teh brokit
Merge branch 'master' into no-cog-yay
resolves issue #1316
use brokit's denoiser
Resolves issue #1383
Remove teh tax2tree from assign_braxonomy.py
fix brokit license

thanks @ElDeveloper
Merge pull request #1549 from wdwvt1/issue_1316

Issue 1316 and issue 1383
Merge pull request #1545 from wdwvt1/group_sig_g_test

Group sig g test
cleaned up missing imports
cleaned up imports
removed unused function
modified imports
Merge pull request #1553 from ElBrogrammer/no-cog-yay

No cog yay