Review of ChamplainTile: fix doc and style
Review of ChamplainTile: fix doc and style

Plus a small memory management fix: don't init string vars
with g_strdup ("").

PabloCastellano/libchamplain,StanciuMarius/Libchamplain-map-wrapping,Distrotech/libchamplain,GNOME/perl-Gtk2-Champlain,Distrotech/libchamplain,GNOME/libchamplain,StanciuMarius/Libchamplain-map-wrapping,GNOME/perl-Champlain,potyl/champlain,potyl/champlain,potyl/champlain,PabloCastellano/libchamplain,PabloCastellano/libchamplain,potyl/champlain,GNOME/perl-Gtk2-Champlain,StanciuMarius/Libchamplain-map-wrapping,PabloCastellano/libchamplain,Distrotech/libchamplain,GNOME/perl-Champlain,GNOME/libchamplain,Distrotech/libchamplain,PabloCastellano/libchamplain,Distrotech/libchamplain,StanciuMarius/Libchamplain-map-wrapping,StanciuMarius/Libchamplain-map-wrapping