Remove some unused variables; add some headers that were missing; fix some...

Remove some unused variables; add some headers that were missing; fix some returns that were void or not void inappropriately; change a couple of variables to size_t

git-svn-id: http://svn.net-core.org/repos/t-engine4@628 51575b47-30f0-44d4-a5cc-537603b46e54