Some code cleanup in dignliste and faster season change (inspired by neroden)

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6555 8aca7d54-2c30-db11-9de9-000461428c89
FIX: no crash on brioken tunnels

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6556 8aca7d54-2c30-db11-9de9-000461428c89
Debug code for freelist

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6557 8aca7d54-2c30-db11-9de9-000461428c89
FIX crash on with 64bit pointers

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6558 8aca7d54-2c30-db11-9de9-000461428c89
FIX: crash deleting line in line management window

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6559 8aca7d54-2c30-db11-9de9-000461428c89
(kierongreen) FIX: correctly save ground heights

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6560 8aca7d54-2c30-db11-9de9-000461428c89
FIX: compile with COLOUR_DEPTH=0 again

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6561 8aca7d54-2c30-db11-9de9-000461428c89
FIX: initialize offsets with dummy values for COLOUR_DEPTH==0

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6562 8aca7d54-2c30-db11-9de9-000461428c89
FIX crash in image_reader with COLOUR_DEPTH == 0

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6563 8aca7d54-2c30-db11-9de9-000461428c89
FIX: use delete_node to delete stale besch's

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6564 8aca7d54-2c30-db11-9de9-000461428c89
FIX: correctly top next window when closing the current top window

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6565 8aca7d54-2c30-db11-9de9-000461428c89
reduce code duplication

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6566 8aca7d54-2c30-db11-9de9-000461428c89
FIX: clear scenario string cache when starting new scenario

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6567 8aca7d54-2c30-db11-9de9-000461428c89
CHG: only update toolbars after finishing calls to script in scenario_t::step

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6568 8aca7d54-2c30-db11-9de9-000461428c89
Default freelist debugging off again

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6569 8aca7d54-2c30-db11-9de9-000461428c89
(Max-Max) First preparation for GUI overhaul

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6570 8aca7d54-2c30-db11-9de9-000461428c89
FIX: bound check for accessing water_hgt

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6571 8aca7d54-2c30-db11-9de9-000461428c89
(Max-Max) FIX: client area of scrolled windows correct

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6572 8aca7d54-2c30-db11-9de9-000461428c89
(Max-Max) slightly reordered option dialogue

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6573 8aca7d54-2c30-db11-9de9-000461428c89
FIX: endless waiting before long block signals direct in front of stations

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6574 8aca7d54-2c30-db11-9de9-000461428c89