Allow overriding the location of exo plugins by setting and environment variable: EXO_PLUGIN_PATH
Allow overriding the location of exo plugins by setting and environment variable: EXO_PLUGIN_PATH

Can use : to separate multiple directories to search in.

danslimmon/exoline,danslimmon/exoline,tadpol/exoline,asolz/exoline,tadpol/exoline,asolz/exoline