Unionfs cleanups and fixes

The following patches consist of mostly cleanups of the Unionfs code, as
well as fixes for several harder to hit bugs (resource/memory leaks).

As before, there is a git repo at:

git://git.kernel.org/pub/scm/linux/kernel/git/jsipek/unionfs.git

(master.kernel.org:/pub/scm/linux/kernel/git/jsipek/unionfs.git)

There are 21 new commits:

	Unionfs: Correctly decrement refcounts of mnt's upon branch management
	Unionfs: Removed a trailing whitespace
	Unionfs: Actually catch bad use of unionfs_mnt{get,put}
	Unionfs: Remove defunct unionfs_put_inode super op
	Unionfs: Documentation update regarding overlapping branches and new lookup code
	Unionfs: Disallow setting leftmost branch to readonly
	Unionfs: Use krealloc instead of open-coding the functionality
	Unionfs: Call realloc unconditionally
	Unionfs: Don't leak resources when copyup fails partially
	Unionfs: Prefix external functions with 'extern' properly
	Unionfs: Combine unionfs_write with __unionfs_write.
	Unionfs: Move unionfs_query_file to commonfops.c
	Unionfs: Rename our "do_rename" to __unionfs_rename
	Unionfs: Rename Unionfs's double_lock_dentry to avoid confusion
	Unionfs: Consistent pointer declaration spacing
	Unionfs: Added numerous comments
	Unionfs: Cleanup of strings and comments
	Unionfs: Add missing copyright notices
	Unionfs: Every printk should prefix with "unionfs: " consistently
	Unionfs: Coding style fixes
	Unionfs: Tiny documentation fixups

Thanks,

Josef 'Jeff' Sipek <jsipek@cs.sunysb.edu>

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