Initial checkin of STL checkpointing. This checkin only covers the sequential
STLs, vector, list, deque, set, and multiset. This checkin does include the
changes in Trick header files to include/exclude our STLs properly to make a
restartable checkpoint.
refs #206
Gave each sim their own model directory, or in some cases just
a header file. Each sim in the test directory is now independent
of each other. Modifying one test will not affect any other test.
refs #191
