Cache

Several cache mechanisms will be implemented but for now, ony one exists.

DirCache

This cache is based on a shared dir and requires no running daemon.

It must be initialized with a file LMAKE/size containing the overall size the cache is allowed to occupy. The value may end with a unit suffix in k, M, G, T (powers of 1024). For example LMAKE/size can contain 1.5T.