-Codechange: Make tile areas and iterators more consistent to each other.

git-svn-id: http://svn.openttd.org/trunk@26289 6aa0318a-3be1-0310-93fa-89fd2396df07
-Codechange: Use nicer orthogonal tile iterator constructor and simplify calculation of explosion points when clearing.

git-svn-id: http://svn.openttd.org/trunk@26290 6aa0318a-3be1-0310-93fa-89fd2396df07
-Fix [FS#5866, FS#5888]: Correctly identify opposite ends of bridges and tunnels when converting rails (adf88)

git-svn-id: http://svn.openttd.org/trunk@26291 6aa0318a-3be1-0310-93fa-89fd2396df07
-Update from WebTranslator v3.0:
czech - 6 changes by Eskymak
estonian - 1 changes by planetmaker
frisian - 152 changes by Geoloep


git-svn-id: http://svn.openttd.org/trunk@26292 6aa0318a-3be1-0310-93fa-89fd2396df07