* switch to xhr.post() almost everywhere

* call App.handlerpcjson() automatically on json request (if possible)
 * show net/log indicators in prefs

themes/light/tt-rss.less

@@ -877,6 +877,19 @@ body.ttrss_main {
 		right : 0px;
 		top : 0px;
 		z-index : 5;
+
+		i.net-alert, .left i.icon-error {
+			color : red;
+		}
+
+		i.log-alert {
+			color : #ddba1c;
+			cursor : pointer;
+		}
+
+		i {
+			margin : 0 4px;
+		}
 	}
 
 	#content-insert {