Significant reworking based on the comments of Harald Meland and Jim

Tittsler.  In summary, each list maintains its own watermark as a
config.db attribute, and the separate gate_watermarks is no longer
used.  This greatly simplifies the logic in this script.

Some specifics,

main(): The command line options have changed, and no longer supports
invocation as "gate_news listname first last".  Added --stderrs/-s,
--quiet/-q, and --help/-h flags.

Removed unnecessary imports.

WATERMARK_FILE, LIST_LOCK_FILE both are gone.  There's a global block
file and each list locks itself when actually doing the gating of
articles.

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