fix to handling of &fromName=[<name>::]<lat>,<lng>

see issue #1553
There may be a bug with this. Upon an initial startup of the page to a trip planner I havent used for a session or more, I sometimes get a complaint that the planner isnt avaiable. I beleive that it's due to an initial call to the planner being cancelled as a result of the from/to names being set in the dialog, but I cant get to the bottom of it and of course it always works on a reload.