ToUTMZone returns wrong zone.

[rolyhudson]

Description:

ToUTMZone returns wrong zone. Zones are numbered from 1 furthest east to 60. The methods currently overlook the number starts at 1.
Need to use (int)Math.Floor((longitude + 180) / 6)+1 in the method.

Steps to reproduce:

Expected behaviour:

Test file(s):