This pull request improves the PdfExportWizard page. Whenever the user exports a pdf the settings are stored in a PreferenceStore. Stored settings such as

• dpi,
• landscape mode,
• page format, and
• margin settings for
  • top
  • bottom
  • left and
  • right

are requested if the user exports the map to pdf again. So the user doesn't have to re-configure the same settings again and again.

In addition refactored properties naming (e.g. lower to bottom)

Signed-off-by: Frank Gasdorf fgdrf@users.sourceforge.net