Switch to integer implementation

Detail:
  The dynamic range of the values being computed easily fit within integer types, so use these instead of doubles. This makes ScrModes independent of its position in intialisation with respect to FPEmulator once more, and saves 1k of code space too.
  Functions generate_mode_using_gtf(), generate_mode_using_cvt_rb(), generate_cvt3_timing() affected.
Admin:
  Test added to brute force compare float and fixed point results.
  Submission for the EDID bounty.

Version 0.55. Tagged as 'ScrModes-0_55'

VersionNum

-/* (0.54)
+/* (0.55)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  * Last processed by srccommit version: 1.1.
  *
  */
-#define Module_MajorVersion_CMHG        0.54
+#define Module_MajorVersion_CMHG        0.55
 #define Module_MinorVersion_CMHG        
-#define Module_Date_CMHG                14 May 2016
+#define Module_Date_CMHG                30 Jul 2016
 
-#define Module_MajorVersion             "0.54"
-#define Module_Version                  54
+#define Module_MajorVersion             "0.55"
+#define Module_Version                  55
 #define Module_MinorVersion             ""
-#define Module_Date                     "14 May 2016"
+#define Module_Date                     "30 Jul 2016"
 
-#define Module_ApplicationDate          "14-May-16"
+#define Module_ApplicationDate          "30-Jul-16"
 
 #define Module_ComponentName            "ScrModes"
 #define Module_ComponentPath            "castle/RiscOS/Sources/Video/UserI/ScrModes"
 
-#define Module_FullVersion              "0.54"
-#define Module_HelpVersion              "0.54 (14 May 2016)"
-#define Module_LibraryVersionInfo       "0:54"
+#define Module_FullVersion              "0.55"
+#define Module_HelpVersion              "0.55 (30 Jul 2016)"
+#define Module_LibraryVersionInfo       "0:55"

h/modex

@@ -165,6 +165,8 @@ typedef struct
 #define IS_MODE_SEL_PTR(p) (!IS_MODE_NUMBER(p))
 #define UNUSED(k)          ((k)=(k))
 #define MODESEL(p)         ((ModeSelectorRef)(p))
+#define MAX(a,b)           (((a)<(b))?(b):(a))
+#define MIN(a,b)           (((a)>(b))?(b):(a))
 
 /*
  * Monitor & modes description as loaded from ModeInfo file: note,