SDL renderer improvements and fixes and added SDL OpenGL option;

Various performance improvements;
Fixed USB UHCI HCHalt;
Cirrus Logic CL-GD 5422/24 fixes and removed them from the Dev branch;
The Storage controllers sections of Settings now has its own corresponding section of the configuration file;
Fixed the AT clock divisors for some Pentium OverDrive CPU's;
Added the ACPI RTC status (no ACPI RTC alarm event yet).

src/machine/m_amstrad.c

@@ -301,7 +301,7 @@ vid_write_1512(uint32_t addr, uint8_t val, void *priv)
     amsvid_t *vid = (amsvid_t *)priv;
 
     egawrites++;
-    sub_cycles(12);
+    cycles -= 12;
     addr &= 0x3fff;
 
     if ((vid->cgamode & 0x12) == 0x12) {
@@ -320,7 +320,7 @@ vid_read_1512(uint32_t addr, void *priv)
     amsvid_t *vid = (amsvid_t *)priv;
 
     egareads++;
-    sub_cycles(12);
+    cycles -= 12;
     addr &= 0x3fff;
 
     if ((vid->cgamode & 0x12) == 0x12)

src/machine/m_at_t3100e_vid.c

@@ -204,7 +204,7 @@ void t3100e_write(uint32_t addr, uint8_t val, void *p)
         egawrites++;
 
         t3100e->vram[addr & 0x7fff] = val;
-        sub_cycles(4);
+        cycles -= 4;
 }
 	
 
@@ -213,7 +213,7 @@ uint8_t t3100e_read(uint32_t addr, void *p)
 {
         t3100e_t *t3100e = (t3100e_t *)p;
         egareads++;
-	sub_cycles(4);
+	cycles -= 4;
 
         return t3100e->vram[addr & 0x7fff];
 }

src/machine/m_xt_t1000_vid.c

@@ -194,14 +194,14 @@ static void t1000_write(uint32_t addr, uint8_t val, void *p)
         egawrites++;
 
         t1000->vram[addr & 0x3fff] = val;
-        sub_cycles(4);
+        cycles -= 4;
 }
 	
 static uint8_t t1000_read(uint32_t addr, void *p)
 {
         t1000_t *t1000 = (t1000_t *)p;
         egareads++;
-	sub_cycles(4);
+	cycles -= 4;
 
         return t1000->vram[addr & 0x3fff];
 }