Yona's module loader is very simple and respects environmental variable
YONA_PATH. If this variable is not set, then current working directory is used as a base directory for loading modules. Multiple paths may be separated with a default platform path separator:
: on UNIX and
; on Windows.
Modules are loaded in the order of directories specified in the
YONA_PATH, and first found location wins.
Modules are cached in Yona, and if a module was already loaded once, then changes made to it on a disk will not be reflected.