Making Pynteny pip-installable

[Robaina]

So far, Pynteny depends on bioconda packages and has been distributed as a conda package. However, there are pip-installable alternatives to all dependencies. Particularly, PyHMMER and Pyrodigal could be used instead of the native HMMER and Prodigal (which are not pip-installable).

It is worth exploring those two packages to see how well would integrate into Pynteny, to make Pynteny also pip-installable.

[Robaina]

Closing this issue for now. Pynteny works well in conda.