For tools where there is a bioconda recipe is available, use conda for install/ensure procedures

[armish]

As @rleonid pointed out, bioconda channel seems to have quite a bit of recipes covering many of the bases in the Bioinformatics field. Since bioconda is, by default, a supported channel for us (https://github.com/hammerlab/biokepi/blob/master/src/environment_setup/conda.ml#L39), would be great to ditch problematic installation procedures (e.g. the one we have for OptiType) and use conda install instead.