(svn r4670) - Backport from trunk (r4435):
In CmdRemoveRoad tiletype was not checked for ownership (heavily edited)

(svn r4669) - Backport from trunk (r4343):
[Autoreplace] Fix drawing of train list for outdated engines.

(svn r4668) - Backport from trunk (r4301):
Fix: the maxlength parameter of Textbuf is supposed to be the siz
of the buffer (so length of string + '\0'), but in the code it
was a mix of both.

(svn r4667) - Backport from trunk (r4291):
Fix: validate all received strings for correctness. This fixes
potential crashes on hacked clients/servers

(svn r4666) - Backport from trunk (r4267):
Validate the error number that a client receives from a server, and
encapsulate this functionality into GetNetworkErrorMsg()

(svn r4665) - Backport from trunk (r4241, r4243):
Fix: Perform validation on the error number that a server receives
from a client. An invalid value may cause the server to terminate.

(svn r4664) - Backport from trunk (r4228):
Fix: [autoreplace] allow replacement of wagons even when the
engine fails to be replaced

(svn r4663) - Backport from trunk (r4195):
Codechange: Initialize order variables to avoid a compiler warning.

(svn r4662) - Backport from trunk (r4192):
Fix: In the depot, moving wagons from the end of a very long train
to a short train where the short train was scrolled off the window
would cause a game crash.

(svn r4661) - Backport from trunk (r3865-r3867, r3869, r3870, r3873, r3894, r4059, r4064-r4066, r4217):
Add: a fully optional configure script, that is a wrapper
around makefile.config