Evolution #2957: Add a Welcome page
Genral interface : add a random image feature
This could by activated or disabled in admin menu,
Images could be used from FINDS, OPE or UE (#2927),
it could be used on the welcome page (#2957), or somewhere else ?
a link to the related sheetfile could be provided,
Short description could be given (town / name of OPE,
it could use a sideshow (slow) option.