Rename MSDOS rule files; adjust RM_FORTRAN mode

Rename several MSDOS detection rule files to include category prefixes and improve organization. Files renamed:
- db/MSDOS/RM_FORTRAN.4.sg -> db/MSDOS/compiler_RM_FORTRAN.4.sg (mode changed 100755 -> 100644; only whitespace/formatting normalized, no detection logic change)
- db/MSDOS/REC_small_AV.1.sg -> db/MSDOS/immunizer_REC_small_AV.1.sg
- db/MSDOS/RLE_com-packer.2.sg -> db/MSDOS/packer_RLE_com-packer.2.sg
- db/MSDOS/REC_small.1.sg -> db/MSDOS/protector_REC_small.1.sg
- db/MSDOS/anti-tracing_add-on.1.sg -> db/MSDOS/protector_anti-tracing_add-on.1.sg

No functional changes to detection rules aside from the noted formatting and permission adjustment.

db/MSDOS/compiler_RM_FORTRAN.4.sg

@@ -1,13 +1,13 @@
-// Detect It Easy: detection rule file
-// Author: hypn0 <hypn0@mail.ru>
-
-meta("compiler", "RM/FORTRAN");
-
-function detect() {
-    if (MSDOS.compareEP("fc1eb8....8ed89a........81ec....8becc706........c706........33ffbe....b8....8ec0b9....f3a5897e..b8....ab8cdb8ec3bb")) {
-        bDetected = true;
-    }
-
+// Detect It Easy: detection rule file
+// Author: hypn0 <hypn0@mail.ru>
+
+meta("compiler", "RM/FORTRAN");
+
+function detect() {
+    if (MSDOS.compareEP("fc1eb8....8ed89a........81ec....8becc706........c706........33ffbe....b8....8ec0b9....f3a5897e..b8....ab8cdb8ec3bb")) {
+        bDetected = true;
+    }
+
     sLang = "Fortran";
 
     return result();