Rearrange log flags for more utility

[terrillmoore]

The flags in McciCatena;:cLog are not as useful as they should be; kTrace ends up getting used a lot when something like kVerbose would make more sense.

This fix would:

• separate kTrace from other flags, because it's a debugging flag, not an operating flag (in typical linux terms, -D rather than -v).
• group top 16 bits for use as varieties of kTrace.
• Order the logging bits Bug, Error, Warning, Info, Verbose
• Label bits 5 through 7 as "reserved for future library use"
• Add 8 User "logging" bits (bits 8 through 15)
• Make kTrace a synonym for kTrace0, and assign bit 16..23 as library trace bits
• Add 8 user "tracing" bits (bits 24 through 31).

While at it, add overload operators for |, at least, so log masks can be sanely combined.