Replace logical AND by binary AND. Fixes #40 and FS#975.
Merge pull request #45 from kheyse/boolean_and

Replace logical AND by binary AND. Fixes #40 and FS#975.
Fixed some string format specifiers (long int vs int)
Only draw polygons with more than 1 point. wxWidgets 2.9.4 doesn't seem to like it if there's only 1 or less points (assertion error).
Dutch localization fixes