add Tie::JournaledDir which wraps Tie::JournaledFile and uses some

directory as cache area.

add/update test tools for Tie::Journaled{File,Dir} modules.

clean up Tie::JournaledFile
o remove header in the cache file
o $self->{ 'key' }
o $debug is on if $ENV{'debug'} is defined.
o more carefull check of whether the value is defined or not.
o quotemeta() for pre search key in find()
o rename grep() to find()

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