Partial, incomplete implementation of new city limits code
REVERT: Minor save version to 112.3, as nothing used the previous 112.5 designation.
FIX: Ensure there is a valid route index larger than the curretn when trains pass a longblock signal (Prissi, from Standard)
FIX: Compile error with MinGW (Giuseppe)
FIX: Some issues with loading games saved in previous semi-versions
CODE: Add text on setting up a server
CHANGE: Do not save/load cluster_factor and bridge_success_percentage in a network game unless the save version is >= 112005 (which it will be if the save is for transmitting to clients, but not if saving a network game locally).
VERSION: Step version for release.
Trivial commit
Merge branch 'ncn-devel' into fix-city-limits
FIX: Compile error on GCC (some versions)
Implement more restrictive version of city limits.
Fix small errors in city limits code.
Fix further bugs in city limits code.
Fix display of city limits, which had off-by-one and off-by-one-half errors.
Fix calculation of city limits after city builds bridge & building.
FIX: Compile error with MinGW
FIX: Further compile error with (some versions of) GCC
VERSION: Increment to 11.1
FIX: Interest did not register in cash flow