63515011c1
__evict_stat_walk(), __wt_curstat_cache_walk(), query_docs() don't
return error values, switch to void declarations.
__evict_stat_walk() unused variable, bytes_inmem.
WT_CURSOR.{get_key,get_value} and pthread_join can all return errors,
assert they don't fail.
KNF, whitespace
Update spelling list.
Add a new test utility macro, testutil_assertfmt(), so it's possible
to assert with more expansive error messages.