Returns file URL relative to the LemonStand root.
The function makes links independent of the actual LemonStand installation directory name, whenever it
is installed into a subdirectory or to a domain root directory. It is highly recommended to use
this function for creating links, because it can save you lots of time if you decide to move
your LemonStand installation from a subdirectory to the domain root directory.
Using this function
is required in LemonStand Marketplace themes.
For example, if you installed LemonStand into the shop subdirectory of
http://my_host.com domain, the following call
will return
/shop/cart URL:
If you move LemonStand installation to the domain root directory the same function call will return
/cart URL, so that you
do not need to update your links manually.