Fixed disappearing subdivisions.

Was happening on both resize and on extend downward.
Added config options for eavesdropping.
Added config options for eavesdropping. (2)
Code cleanup.

No functional changes.
Removed some limitations on hoppers and mine carts.

No longer needed - building at the bottom of a claim now extends the
claim downward, so no important blocks (like chests) will be thievable
by hoppers or hopper mine carts except in extremely rare,
not-manufacturable situations.
Allowing /ClaimExplosions to override sea level protections.

Except for creepers, explosions may now destroy blocks above sea level
in survival worlds when they originate in a claim with /ClaimExplosions
enabled.  They will not destroy blocks outside of that originating
claim.
Added show all nearby claims by holding shift.

While holding the stick.  Requires a new permission node, to avoid any
lag from spamming this operation.
Version to 9.4