In the recent days, I was investing quite some work in a rewrite of the filenametimestamp module of Memacs for referencing files within Org mode independent of their storage path.
If you are already using this module, you should think of upgrading now because I fixed quite some bugs. Further more, it provides new functionality which could only be found in the corresponding stand-alone PoC module.
I won't go into details here, since I also updated the module documentation. For developers, I also created a decent set of unit tests.
The most current version of Memacs is available via pip install memacs
but it may need some help from experienced users of pip.