TimeTests changed, Shielded comparable with the lock version.

These tests run 10000 increments over an array of 100 ints, with a
1 ms sleep between reading and writing. The lock version is now using
100 locks, perfect granularity, and Shielded is using Assing instead
of Modify (since it is non-commutable now). Shielded is now comparably
fast to the locking version, even with full locking granularity.