Update mkstegfs info
Add copy utility

cpstegfs provides an easy way to copy a directory hierarchy from a
traditional file system to a stegfs file system. And by that I mean it
makes sure that as the copy process descends into deeper directories,
the necessary + gets added to allow stegfs to distinguish between files
and folders.

I doesn't yet allow for easy recovery of a hierarchy from stegfs, but it
shouldn't be too long before we can get that implemented.

In actual fact it will copy anything from anywhere to anywhere else,
you'll just end up with directory names that start with +
Update man page
Add FS stat

* Add support for calls to statvfs
* Update Makefile
Update documentation - add warning!
Represent root / as expected (when parsing paths)
Rewrite cache and directory handling

Use tree sturcture to represent files/directories in cache. This has the
advantage that it can represent directories as expected! No more
prefixing them with a +

Directories are (still) not stored by stegfs, but they can be
represented while mounted, in a more normal manner. They no longer need
to have a + prefix, but every time the file system is mounted, they do
need to be created. Once a directory is created, any files within it can
be stat'd and should appear (if they're not corrupt).

stegfs now also returns sensible information when statfs is called on
it: total capacity, available capacity, etc.
Add info for debugging

* Bought back /proc directory to show used blocks---remember that debug
  builds do not encrypt data
* Remove copy utility as it's no longer needed
Update Makefile and documentation
Free/clear file data as the file is closed.
Update Makefile and header files

* Don’t use __DEBUG__ - it caused seg-faults!
* Use #def for PROC instead
Update documentation
Use new #def add new function

* New functio to remove directories
* Use #def for proc fs info
Use #defs for mkfs
Use #def's where appropriate, empty buffers before use
Add dry run option to mkstegfs
Forget password on close, remember on open
Set errno in a few more places
Generate inode value for directories
Update formatting