[Coco] Extract BIN from DSK

[Robert Gault]

Bob Devries wrote:
> Don't forget that colour computer .BIN files have 10 extra bytes added 
> to the actual code; 5 at the start and 5 at the end, to give information 
> such as length, start address and execute address. As well, not all .BIN 
> files are relocatable, and may not run as a ROM file in a location other 
> than the one for which they were written.
> 

In fact, if the program has multiple origins or was compiled by EDTASM+, 
there will be several of these extra bytes, pre- and postambles. They 
will be present for each origin statement and each block of a 
multi-segment binary program.