Initial notes from RW18 investigation.

I have written up an overview of what I think the RW18 disk format
looks like on disk.  This should help me implement RW18 support in
crackle.

I am also adding the sources for RW18 routines which should work
for 5.25" disks.  It is based on the disassembly I conducted on the
RW18 object code from another RW18 based game.  I will need to move
the ORG address to $d000 for PoP when I am ready to try integrating it
in for a 5.25" disk iamge.
Update main build notes.

Add a link to the new RW18 overview notes.  Also thank the people that
have helped make the build process possible.
Update notes.

Added links to snap and crackle utilities.
Update build notes to document new files that I have recently added to
the Other/ subdirectory.
Make Prince of Persia run from 5.25" disk images.

Updated the crackle disk imaging tool and build process to support the
production of 5.25" disk images in addition to the 3.5" support we
already had.

Updated Makefile to create another 2 disk images.  One for each side of
the 5.25" disk image.

Added Other/PrinceOfPersia_5.25*.layout files to tell crackle how to
put together the files to create bootable 5.25" disk images.  Only the
boot loader and RW18 routines need to be placed on the disk
differently.  All of the other object and media files are placed
exactly the same as they were for the existing 3.5" layout.

Update RW18525.S to move the code up to $D000 where it is required by
Prince of Persia.

I also updated some of my notes to indicate that 5.25" disk images are
now supported.

NOTE: I have made no attempt to have these 5.25" disk images match the
      originally shipped disks.  I just concentrated on getting
      playable images.  The main reason being that I don't have access
      to an original disk to determine what the differences are and
      how they should be corrected.
Update linux tools to version_0.2
Update Windows tools to version_0.2
Fix incremental build for Linux.

BOOT.S assembles down to obj/boot and not obj/BOOT.
Add comments for last fix.

This will remind me why I played around with filename case for certain
files.
Fixes #7 Switch directories back to having spaces.

Updated Makefile and *.layout files to refer to sources and game media
in directories which contain spaces in their filenames.
Merge branch 'working' into build

Pull in 5.25" disk image support and support for spaces in source
directory names.