sgmr* vs. md*

I just changed the call from mdunlink to smgrunlink, but this brings up
a good point.

smgr is a generic i/o interface layer that allows multiple storage
managers. Currently, we always use DEFAULT_SMGR as a parameter to smgr*
functions, causing calls to the md* routines. Is there any value in
just removing the smgr layer completely. It was originally for a CD
jutebox i/o layer in addition to our current disk i/o layer.

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