(OSX/Darwin) Install fails to find /opt/miniconda3 installations

[iannesbitt]

conda's MacOS/Darwin graphical installers put their installations in /opt[ana/mini]conda3. This evades the rsudp installer's detection and causes it to download and install an additional miniconda installation to ~/miniconda3.

• rsudp installer must be able to find /opt/[ana/mini]conda3 installs and work within their structure.
• rsudp installer must respect that zsh is the preferred Darwin shell, rather than bash. Forcing bash may cause issues.
• rsudp installer should work on Darwin out of the box as it does for GNU and other *nix

We probably don't need to install to /opt on Darwin, as it is a protected directory and we want rsudp to be able to avoid permissions complications. (side note: I wonder why they install to /opt rather than the user directory...is it a security thing? I can't imagine it would make much difference in an attack, but it is very annoying to deal with...)

[dmitryint]

For this case we added the creation of symbolic links. This will require a sudo on run, but it works. It will also fail if there are two installations in the /opt and user folder $HOME/$release. Eurasian