Remove troublesome static logging hashmap

Java enums are full-fledged classes... just set level in there.
Also use ALLCAPS for static fields.
Missed some calls to the MemMang deserializing arrays.
Comment fixes
Missed call to MemManager; fix assert
Fix OOM & Logging grief

The GC callback thread uses the system loader; every file it touches will
use the sys loader instead of the water.Boot loader, so only touch a few
global vars.  Do not log under memory pressure, or inside locks, or from
most places in the cleaner thread or in OutOfMemory exception handler.
remove too-strong assert