SYS.COM does not work for every port

[ivop]

Today I noticed CP/M-65 has grown a SYS utility that copies the reserved sectors and the system files to a new disk. This won't work on several ports because either the boot process is completely outside of CP/M's reach where the CP/M filesystem is a file inside another filesystem, like the BBC and x16 port, or the reserved sectors are not readable or writable by CP/M-65 because their format on disk is different from the other tracks, like the OSI port.

I propose removing SYS.COM from BIG_APPS and only include it on systems where it actually works as intended.

Regards,
Ivo