Status bar template position string is now in UTM mode.

UTM strings are longer than the longitude/latitude ones. In order to cope with UTM, the maximum width of the field text showing the position in the status bar has been modified, setting the template position string as in UTM mode.
The following restrictions have been taken into account:
The eastings should cover numbers strictly below 1.000.000 (the maximum is around 833,000 m at the equator)
The northings should cover numbers until 10.000.000 (the equator has this northing value seen from the southern hemisphere)
The maximum precision displayed is of 1 cm.