Rename hashtable tests.
stringtable instead of hashtable.
Rename the existing hashtable to stringtable.
Template ptrtable test suite.
ptrtable signatures.
First ptrtable test.
Use separate includes for different hashtables.
seg_ptrtable implementation.
ptrtable is up and running.
Adapt the rest of the tests while I'm at it.
Stale references to seg_symboltablep.
Pluggable table implementation.
putifabsent test.
Rename it to a plugtable for brevity.
The rest of the tests for plugtable.
Merge pull request #18 from smashwilson/hash-proliferation

Additional hashtable implementations