Fix openlayers wms query:

• the wms query is now visible in the popup;
• only visible layers on the map will be queried, not all;
• the tables returned by the WMS server will have a defined text size;
• a loading icon has been added which makes it clear that the click on the map has been made and that the popup is waiting for the remote WMS server to respond.

solves the problem: #1014 #343