[KiRi] Added check for local file system fail

We then explain why is failing

kibot/resources/kiri/index.html

@@ -16,6 +16,10 @@
 			<span>Server is offline, waiting ...</span>
 		</div>
 
+		<div id="no_file_access" style="display: none; ">
+			<span>The browser can't read local files. Enable it to continue. I.e. use <i>--allow-file-access-from-files</i> on Chrome</span>
+		</div>
+
 		<!-- User Interface -->
 		<div id="main_ui" class="container fill no-gutters ui-style">
 			<div class="row fill align-items-start no-gutters ui-row-style">

kibot/resources/kiri/kiri.css

@@ -194,7 +194,7 @@ label#layers, label#pages {
 	vertical-align:top;
 }
 
-#server_offline {
+#server_offline, #no_file_access {
 	position: fixed;
 	display: none;
 	width: 100%;
@@ -213,7 +213,7 @@ label#layers, label#pages {
 	line-height: 100%;
 }
 
-#server_offline span {
+#server_offline, #no_file_access span {
   display: inline-block;
   vertical-align: middle;
   line-height: normal;

kibot/resources/kiri/kiri.js

@@ -1040,6 +1040,15 @@ var old_server_status = -1;
 
 function check_server_status()
 {
+    try {
+        loadFile("project");
+    } catch(error) {
+        if (window.location.protocol === "file:") {
+            no_file_access();
+        }
+        throw(error);
+    }
+
     var img;
 
     img = document.getElementById("server_status_img");
@@ -1081,6 +1090,11 @@ function server_is_offline() {
     }
 }
 
+function no_file_access() {
+    document.getElementById("no_file_access").style.display = "block";
+    console.log("Failed to load local files, enable access to them");
+}
+
 // ==================================================================
 
 function createNewEmbed(src1, src2)