Mapserver GRID enhancement - degrees and decimal minutes format

[PedroVenancio]

Hi all,

At this moment, it's not possible to use a GRID [0] in degrees and decimal minutes LABELFORMAT. Something like:
40 46.817 -7 4.327

LABELFORMAT "DDMM" gives only the integer part of Degrees and Minutes.

Using C-style formatting string, it's possible use %g, %f, etc., but it is only applied to Degrees component.

It would be a good improvement something like "%gº %3.2f", in whitch %gº were for the Degrees, and %3.2f for the decimal Minutes.

Some TETRA (Terrestrial Trunked Radio [1]) equipments, widely used by emergency services, only give the GPS coordinates in this format, and so I think this could be a good enhancement for Mapserver applications.

[0] http://mapserver.org/mapfile/grid.html
[1] https://en.wikipedia.org/wiki/Terrestrial_Trunked_Radio