Get printing parameters in the begining

- Set parameters for scaling the layout ( w and h_scale_factor),
  number of prints per page and rotation.
- Let draw_page() manage the whole print whith the received params.
- Remove draw_oneperpage() as it's unused.
- Use the w_scale_factor for scaling the fonts.
- Change option text in the GTK menu.

TODO:
- A GTK menu which let the user select the print params directly or ...
- Introduce new predefined options in the printing menu.
- Modify draw_page() for printing "landscaped" 6 dives if selected.

Signed-off-by: Salvador Cuñat <salvador.cunat@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Better fix for translated cardinal directions

The previous attempt in commit f305c5c83fe1 ("Correctly parse translated
cardinal directions") suffered from a bit of false advertising in that it
wasn't, actually, "correct". It made silly assumptions about the length of
the translated strings being 1 and also forgot the middle part of the
algorithm where we use the appearance of 'E' or 'W' (and their translated
brethren) as indication that there are no minutes for the the latitude.

Hopefully this version does better.

Reported-by: Sergey Starosek <sergey.starosek@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>