GXemul Code2

Implementing an X11 mouse pointer grab mechanism. Grab is activated by clicking in a framebuffer window, and released using left CTRL + ALT. When grab is active, the host mouse cursor is hidden and the window caption changes to indicate that grab is active.

mvme187old -> mvme187

Code for idling the host processor has been moved out from individual CPU implementations to the main emul loop. Only if all running CPUs in all machines are idling will the host CPU idle. Also, if the return value from usleep() indicates an aborted syscall (due to signal delivery), then a second usleep() call is attempted.

Adding 'R' (upper-case) disk image prefix, as a shorthand for creating temporary overlays.

Adding unlikely(), although it is unlikely that it matters that much.

Beginning to experiment with detecting/implementing support for the idle function used by OpenBSD/luna88k.

Adding hardcoded boot_unit=0 and boot_partition=0 NVRAM variables to the LUNA-88K machine, allowing OpenBSD/luna88k to boot from disk without asking for root and swap partitions.

Some color in the usage message and other messages.

Minor debugmsg:ification of diskimage messages, including minor improvement regarding r: prefix.