testing some mapcss text rendering approach
add mapbbcode licence info
make only text-part of (short) PopupIcons clickable

I see that icons must have a fixed width in order to center them. But it resulted in the whole area being clickable (even the transparent areas right and left of the text). This behaviour is especially confusing if texts are short, but right next to each other.

This uses [pointer-events](http://caniuse.com/pointer-events) to make the transparent areas right and left of PopupIcons non-clickable. And it doesn't harm older browsers.
update leaflet to 0.7.3
leaflet-upgrade part 2
update jquery to v1.11.1
make default map coordinates configurable

see #71
better legibility for some Overpass API error messages

closes #65
fix tooltips that didn't change on manual language settings

fixes #55
add a tooltip to the disabled state of the bbox-selector tool

closes #64
toggle, rather than clear, data overlay

implements and closes #67
prevent doubleclicks on map tools to zoom the map
prevent doubleclicks on search box to zoom the map
show additional stats as hover/tooltip of stats box

displaying the "currentness of data" aka lag behind OSM db (see #44)
write (full) Overpas API error message to js console
update translations
update presets from iD project (iD v1.4.0)

including much improved tagging of presets from name-suggestion-index
grab new strings back from transifex
Merge branch 'master' into text-markers
still show circle markers even when text markers are shown