Patch for 'Not to stuff everything as files in a single directory, hash dirs'

Hello all,

I did small patch for subj. I am sure that it is not perfect, but it works for me.
I will continue its testing. This is my first patch to pgsql. If you will find some
obvious mistakes, do not flame, just show the right way.

If you have further suggestion/ideas, do not hesistate to contact me.

-- 
Sincerely Yours,
Denis Perchine

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