* Fix a variety of bugs found in dllist.c while addressing Issue #1559.
* Added More descriptive error messages.
* Wrote google-test based unit tests for the DLL List library.
* Deleted old, incomplete test program.
* Added new function DLL_ListContainsPos which determines whether the given list contains the node at the given pos.
* DLLFind bug: Added check to determine whether a compare function has been specified, and emit an error message if it hasn’t.
* DLL_FindIndex bug: Corrected bounds checking.
* DLL_GetAt bug: Added check to ensure that the specified pos is actually in the given list.
* DLL_SetAt bug: Added check to ensure that the specified pos is actually in the given list.
* DLL_RemoveAt: corrected logic mistake in NULL ptr check. Added check to ensure that the specified pos is actually in the given list.
* DLL_InsertBefore bug: element count not correctly updated.
* DLL_InsertAfter: next and prev ptrs not correctly updated, which corrupted the list.
* DLL_GetNext bug: logic error in NULL ptr checks. Added check to ensure that the specified pos is actually in the given list.
* DLL_GetPrev bug: logic error in NULL ptr checks. Added check to ensure that the specified pos is actually in the given list.
* DLL_AddHead: Fixed NULL check logic error.
* DLL_AddTail: Fixed NULL check logic error.
* Address review comments, remove extraneous make target.
* Change false to 0 in dllist.c
Reorganized. Created a new top level include directory that will hold all of Trick's header files. Moved all of the Trick headers to this directory. Created a libexec directory that holds all of the executables that users don't need to execute directly. Changed all of the executables remaining in bin to start with "trick-". In the sim_services directories changed all source files to find the Trick headers in their new location. Since all of the include files are gone in sim_services, removed the src directories as well, moving all of the source files up a level. Moved the makefiles, docs, man, and other architecture independent files into a top level share directory. Renamed lib_${TRICK_HOST_CPU} to lib64 or lib depending on the platform we're currently on.
refs #63
Changed all header file once include variables to follow the same naming
convention and not start with any underscores. Also deleted old
incorrect copyright notices. Also removed $Id: tags from all files.
Fixes#14. Fixes#22.
