dquot interface cleanups v2

Get rid of the dquot operations that were used for calls from the
filesystems into the dquot code, clean up the namespace for calls
to the dquot code to always be dquot_, and move the few calls into
the dquot code that were in the VFS into the filesystems.

This version dddresses various comments from Jan and adds a new patch
to get rid of the QUOTA_OK / NO_QUOTA return values.

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