Make fgLoadProps more flexible, to read from $FG_ROOT or the current

directory.

src/Main/fg_props.cxx

@@ -683,12 +683,25 @@ fgLoadFlight (istream &input)
 }
 
 
-void
+bool
-fgLoadProps (const char * path, SGPropertyNode * props)
+fgLoadProps (const char * path, SGPropertyNode * props, bool in_fg_root)
 {
-    SGPath loadpath(globals->get_fg_root());
+    string fullpath;
-    loadpath.append(path);
+    if (in_fg_root) {
-    readProperties(loadpath.c_str(), props);
+        SGPath loadpath(globals->get_fg_root());
+        loadpath.append(path);
+        fullpath = loadpath.str();
+    } else {
+        fullpath = path;
+    }
+
+    try {
+        readProperties(fullpath, props);
+    } catch (const sg_exception &e) {
+        guiErrorMessage("Error reading properties: ", e);
+        return false;
+    }
+    return true;
 }
 
 

src/Main/fg_props.hxx

@@ -65,11 +65,18 @@ extern bool fgLoadFlight (istream &input);
 
 
 /**
- * Load properties from a file relative to $FG_ROOT.
+ * Load properties from a file.
  *
- * @param file The file name relative to $FG_ROOT.
+ * @param file The relative or absolute filename.
+ * @param props The property node to load the properties into.
+ * @param in_fg_root If true, look for the file relative to
+ *        $FG_ROOT; otherwise, look for the file relative to the
+ *        current working directory.
+ * @return true if the properties loaded successfully, false
+ *         otherwise.
  */
-extern void fgLoadProps (const char * path, SGPropertyNode * props);
+extern bool fgLoadProps (const char * path, SGPropertyNode * props,
+                         bool in_fg_root = true);