TdbBuilder_v2.patch: Fix possible issues with unaligned tile boundaries caused by rounding.
Use the unchanged bbox of the input file if that is large enough, else place the bbox in the middle of a overview map that is just large enough. 

git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@2537 25d90789-57f7-4ee0-8453-03a3dfeeeb22
align_subdiv_center_v1.patch : Avoid cosmetic problems seen in Mapsource or Basecamp.
Place sub division centers on a grid calculated 
with the corresponding resolution to avoid gaps because of rounding.


git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@2538 25d90789-57f7-4ee0-8453-03a3dfeeeb22