10/21/09 - Modified interlocked version to correspond to the approach used
in MIPS implementations since ISA III.  Interlocking is used to eliminate the
need for delayed load, but not the need for delayed branch.  This entailed
changes to the following files:

src/mipssimulation/cpu/interlocked/InterlockedCPU.java
doc/Description.pdf - to reflect changes
index.html - to reflect changes

10/22/09 - Replaced sample lab with 2009 version (which actually matches the
code to be given students; the previous lab version matched an older version of
the code!)