Committing the in-progress work on HashMap. (NOTE: This code does not compile!)
More progress on implementing HashMap. Much of the code imported from IntMap is commented-out for now until we get the basics working.
Merge branch 'master' into hashmap
More progress on HashMap -- re-implemented most of the functions in PatriciaHashMap and ListMap.
Most HashMap functions are back to a working state, though nothing has been tested yet.
Created HashMap tests based on the IntMap tests. More testing is needed (e.g., with various key types), but most of the tests (29/32) currently pass.