#41: Use OEH style for page tabs

Copied tab images to subdirectory under webapp\scripts
#171: Tab line too short

Line below tabs stops just short of RHS. Removed apparently obsolete
definition.
#32: Use licensed images

Added new icons from Pete Sherratt:
gearth_icon.png
webservices_icon.jpg
gis_icon.png
download_icon.png
#172: REST & KML give download instead

Fixed: Acknowledge and Connect to REST and KML services previously
worked OK but now open a Download dialog in a new window (see issue
#57).
#149: BBF typo

In BBF (large file) request popup, "user surveys" is misspelt "user
serveys". Also fixed misplaced "occasional" and errant capital on
"policy".