Graticule labels incorrect between 0 and -1 degrees using DDMM / DDMMSS formats

[rma@…]

Using the DDMMSS or DDMM labelformats for graticule labels, grid lines drawn 
between 0 degrees and -1 degrees are incorrectly labelled as positive. I.e. -
0.25 degrees is incorrectly shown as "0 15 00" (POSITIVE 0 degrees 15 minutes 
0 seconds, instead of negative). Positive 0 15 00 appears twice, once on both 
sides of the meridian.

This is a particular problem here in the UK where -1 to 0 degrees covers the 
main area which we are mapping.

Found error using phpmapscript on v4.4.1, but a look at the latest code for 
_FormatLabel in mapgraticule.c appears to show the same problem in latest 
release.



As a side note, some more useful label formats would be appreciated. In 
particular, it would be more appropriate to be able to show 'N'/'S' or 'E'/'W' 
instead of the negative symbol when using imperial formats.