Improve testing threading builds.
Copied thread examples for merging.
Copied adpthread_manager for merging and created initial unit tests for adpthread_manager.
Intermediate branch for merging threaded2 to trunk
Add more unit tests for dlist and ad_comm
Move adstring_array test to gtests.
Move atan2 tests to gtests.
Rename test directory to tests.
Copied revision 1006 from shibi to nceas. Old version control will now be only read only. This will be the primary version control.