The implementation is now similar to set-associative caches
that x86 CPU use.  Also the API is changed a bit, leading to
slight simplification of our use patterns.

Marek Vavrusa authored 8 years ago and Vladimír Čunát committed 8 years ago

`make bench` now runs a predefined set of
microbenchmarks (right now LRU), it's a start
for comparative microbench of internal structures

The Makefile isn't perfect. I noted it doesn't clean the bench,
but we have the same problem for some other parts, e.g. in deckard.