(svn r13251) -Codechange: rename _patches to _settings as that is more logic.
-Codechange: move all Settings into substructs of _settings in a way that they are logically grouped.

(svn r12024) -Codechange: Reduce code duplication inside tree_cmd.
-CodeChange: When rocks get removed while planting trees, barren the ground.
-Fix: In one case trees could spread under bridges.

(svn r12022) -Revert(r12018): Invisible trees are now separate from the building concept.
So when you want invisible trees, just select the option of the same name in the Patch Options and toggle transparency of trees.
More to come on the saga of Invisibility. So stay tuned.

(svn r11533) -Codechange: Rename some unclear clear_x prices member names.
While at it, remove one unused entry on the clear_price_table array.
It is based on ground type, and the unused one was referencing a non existing one.

(svn r11523) -Codechange: Move the CHANCE macros to core/random_func.cpp cause they depend on Random()
-Codechange: Convert the CHANCE macros to functions and rename them fitting to the naming style

(svn r11399) -Feature(ette): transparency settings can now be saved and thus remembered.
-Codechange: Wrap all transparency settings in accessors, hiding the implementation
-Change: Clicking "transparent building" menu will toggle Houses And Trees only. The other options can be used in the transparency gui.
Initial patch by Smatz (FS#1349), with some rework by BigBB and your humble servant.

(svn r11244) -Fix: trees can now be planted on bare land without making it grassy (Csaboka)
-Fix: planting tree in desert doesn't make it grassy for the first tile-cycle (Csaboka)
-Fix: when a tree dies in desert, it no longer becomes a snowy tile for the first tile-cycle (Csaboka)

(svn r11005) -Codechange: move the tiletype specific terraforming checks to the functions for those tile types.
-Codechange: barren the rail grounds on terraforming.

(svn r9371) -Feature: Add support for variable snow lines in the arctic climate, supplied
by newgrf files. When this is enabled forests cannot be built below the highest
snow line, and farms can't be built above it. Houses still use the
_opt.snow_line so they are all consistent, so to make them respect the snowline
you may want to use some newhouses features as well.

(svn r8875) -Fix

Remove unnecessary EnsureNoVehicle() checks because they are
- pointless per se (f.e. there are no vehicles on house tiles)
- done again (f.e. using CMD_LANDSCAPE_CLEAR just a few lines later)

(svn r8841) -Fix

Remove {,u}intswap() and replace them by Swap()

(svn r8128) -Codechange: Split sprite and palette remap into separate 32 bit values.
This lets us increase the sprite width from 14 to up to 29 bits,
effectively nulling the old sprite limit. Table changes in next commit.