GitLab

Made sure on return from global_error the V bit gets set,fixes bug in finding the free space on a floppy (since freespace64 is tried first but which led to the pointer to the error message being returned as the freespace rather than the caller trying again another way).

Correction to missing \ in the makefile,meant you could only compile
it once having checked it out.
Fixed a pointer in the DiscOp64 support added,this caused DOSFS to go
pop when you asked it to vet a format.

Version 0.71. Tagged as 'DOSFS-0_71'