createCache: Function used to create or activate a permanent cache.
Description
Permanent cache is located by default in user data dir.
Usage
createCache(path = NULL)
Value
No return value, called for side effects
Arguments
path
Use a custom path to host cache
Details
You can provide a custom path (that will be defined as a BIOMASS.cache option)
but clearCache function will refuse to operate on it for security reasons.