whitespace
__wt_config_next() has lots of possible errors, check for not-found
at the end of the loop.
lint, assert a few errors aren't happening.
Change the gcc spinlock implementation of __wt_spin_trylock to return
0/EBUSY instead of 0/1, to match the behavior of pthread_mutex_trylock.
Closes #762.
Align session handles and lsm chunks on the cache line.