Option UNITS=IMPERIAL added

SD card archive function continued (doesn't delete the model until function finished)
Alternate view for outputs in Main Views (Bars and Numbers)
GPS speed was badly displayed (ap instead of bp)

src/gruvin9x/logs.cpp

@@ -40,6 +40,7 @@ FIL g_oLogFile;
 int8_t g_logState = 0; // 0=closed, >0=opened, <0=error
 const pm_char * g_logError = NULL;
 
+// TODO initSDCard()
 void initLogs()
 {
   // Determine and set log file filename
@@ -65,6 +66,18 @@ void initLogs()
     return;
   }
 
+  DIR dir;
+  result = f_opendir(&dir, MODELS_PATH);
+  if (result != FR_OK) {
+    if (result == FR_NO_PATH)
+      result = f_mkdir(MODELS_PATH);
+    if (result != FR_OK) {
+      g_logState = -result;
+      g_logError = PSTR("Check " MODELS_PATH " folder");
+      return;
+    }
+  }
+
   // Loop, skipping over any existing log files ... _000, _001, etc. until we have a unique file name
   while (1)
   {