Installation fixes

[multimeric]

Fixes #284.

Changes

• Put the environment name into a variable which would allow it to be changed into a CLI flag
• Use $pkg_manager instead of conda throughout
• Don't activate the created environment at all, but rather conda run --name commands inside it. This avoids any need for shell configuration, activating the env or needing to locate it. This also makes it more shell independent.
• Fix spelling mistake
• Add terminating newline
• Make the script executable so it can be run as ./install_bindcraft.sh

Testing

I've tested this on our HPC with ./install_bindcraft.sh -p micromamba. This tests the case where the conda installation is in a different location to the environment.