Add hashmap implementation -- unfinished and untested
Experiment with simpler MACRO-based list implementation
Implement ZArray
ZTest testing harness
Unit tests for ZARRAY module
Add benchmark test for zarray
Start adding doxygen documentation.  Also, delete some files
Delete Ag files, now that we're renaming the library to "Z"
Move files to "under_construction" directory
Improved implementation of zarray

- Runs faster
- Uses pointer to object instead of header
- Generic-style datatype

- Unfortunately, it now produces some compiler warnings
Fix new implementation of ZARRAY to not have warnings

- update benchmark and unit tests.
Add .gitignore file
Remove old implementation of ZARRAY