GSHHS charts for vrtool

[omar]

For those seeking charts for VRTool and Navigator, I converted the
recent GSHHS database to cht format. Version 2.3.4 of the database was released Jan. 1, 2015.
I included lakes, islands in lakes, antarctic ice front and ground line. Files are zipped.

Download links in the Wiki page

GSHHS page: http://www.ngdc.noaa.gov/mgg/shorelines/gshhs.html