Purpose of `conda--get-path-prefix` about conda.el

[necaris]

Hopefully closed by #23

[necaris]

It's mostly true that right now conda--get-path-prefix simply returns the executable directory within the env directory (I seem to recall it does something different on Windows, but I may be misremembering). The intent, however, is to be robust to any changes in how conda handles this; hence the call out to conda ..activate to return the information, if conda should change formats.

If we can be sure that the behavior will be consistent on Windows and other platforms I have no objections to changing how it's used or implemented.