CMD FD: Support D1M, D2M, D4M image types

Refs keirf/flashfloppy#922

src/greaseweazle/data/diskdefs.cfg

@@ -475,6 +475,63 @@ disk commodore.1581
     end
 end
 
+disk commodore.cmd.fd2000.dd
+    cyls = 81
+    heads = 2
+    tracks 0-80.0 ibm.mfm
+        secs = 10
+        bps = 512
+        gap3 = 30
+        rate = 250
+        h = 1
+    end
+    tracks 0-80.1 ibm.mfm
+        secs = 10
+        bps = 512
+        gap3 = 30
+        rate = 250
+        h = 0
+    end
+end
+
+disk commodore.cmd.fd2000.hd
+    cyls = 81
+    heads = 2
+    tracks 0-80.0 ibm.mfm
+        secs = 10
+        bps = 1024
+        gap3 = 116
+        rate = 500
+        h = 1
+    end
+    tracks 0-80.1 ibm.mfm
+        secs = 10
+        bps = 1024
+        gap3 = 116
+        rate = 500
+        h = 0
+    end
+end
+
+disk commodore.cmd.fd4000.ed
+    cyls = 81
+    heads = 2
+    tracks 0-80.0 ibm.mfm
+        secs = 20
+        bps = 1024
+        gap3 = 116
+        rate = 1000
+        h = 1
+    end
+    tracks 0-80.1 ibm.mfm
+        secs = 20
+        bps = 1024
+        gap3 = 116
+        rate = 1000
+        h = 0
+    end
+end
+
 disk dec.rx01
     cyls = 77
     heads = 1

src/greaseweazle/image/d81.py

@@ -11,6 +11,18 @@ class D81(IMG):
     default_format = 'commodore.1581'
     sides_swapped = True
 
+class D1M(IMG):
+    default_format = 'commodore.cmd.fd2000.dd'
+    sides_swapped = True
+
+class D2M(IMG):
+    default_format = 'commodore.cmd.fd2000.hd'
+    sides_swapped = True
+
+class D4M(IMG):
+    default_format = 'commodore.cmd.fd4000.ed'
+    sides_swapped = True
+
 # Local variables:
 # python-indent: 4
 # End:

src/greaseweazle/tools/util.py

@@ -268,6 +268,9 @@ def split_opts(seq):
       '.adm': ('ADM','acorn'),
       '.adl': ('ADL','acorn'),
       '.ctr': ('CTRaw','caps'),
+      '.d1m': ('D1M','d81'),
+      '.d2m': ('D2M','d81'),
+      '.d4m': ('D4M','d81'),
       '.d64': 'D64',
       '.d71': ('D71','d64'),
       '.d81': 'D81',