Applied the recent mainline PCem commits (and fixed the Pentium machines);

Ported the Roland MT-32 emulation (using MUNT) from bit's MT32 emulation branch of PCem;
Sanitized the OpenAL give buffer code in openal.c a bit;
NVR path is now specifiable in the Settings dialog;
Added Logitech 3-button serial mouse per protocol description by waltje;
The RTL8029AS and the BT-958D now actually use the PCI IRQ routing;
Fixed BT-958D PCI device initialization on the bus;
PCI IRQ routing now respects the edge/level setting set on ports 4D0/4D1.

src/NETWORK/net_ne2000.c

@@ -243,7 +243,7 @@ nelog(int lvl, const char *fmt, ...)
 static void
 nic_interrupt(nic_t *dev, int set)
 {
-    if ((PCI && dev->is_pci) && (dev->base_irq == 0xff)) {
+    if (PCI && dev->is_pci) {
 	if (set)
 		pci_set_irq(dev->card, PCI_INTA);
 	  else