Installation through `mamba`

[valentynbez]

Improvement Description
Due to a growing number of packages, instead of installing through conda install through parallelizable mamba to speed up installation.

Current Behavior
conda env create -n qiime2 --file qiime2.yml.

Proposed Behavior
conda install mamba
mamba env create -n qiime2 --file qiime2.yml

References

1. Mamba documentation

[thermokarst]

Hi @crusher083 - my understanding is that mamba is a drop-in replacement for conda, so the steps you proposed above should just work. Did you try it and run into some kind of issue? Or are you proposing that we add this to the user docs? Let me know what you had in mind and I'll make sure this issue winds up in the right place. Thanks!

[valentynbez]

@thermokarst QIIME2 is a package-heavy software, so I propose adding it to docs, as it speeds up the installation of QIIME2 significantly.

time conda env create -n qiime2-2020.8 --file qiime2-2020.8-py36-linux-conda.yml 
real    5m23,541s
user    3m42,669s
sys     0m20,728s

After env removal and cleaning cache with conda clean -a

time mamba env create -n qiime2-2020.8 --file qiime2-2020.8-py36-linux-conda.yml 
real    3m15,572s
user    2m19,527s
sys     0m20,032s