(svn r18781) -Codechange: pass the CommandCost to the callback instead of whether it succeeded or not.
-Fix: AIs did update their last cost incorrectly in network games if the cost of the DC_EXEC phase differed from the ~DC_EXEC phase.

(svn r17928) -Codechange: ShowErrorMessage() now takes the summary string before the details string.
Gentlemen, swap your string parameters.

(svn r14897) -Codechange: don't allow a few command flags to be sent over the network as it's bogus information anyway; e.g. the "do not send over network" flag as it will be set whenever the command is received from the server/client.
-Codechange: test earlier whether the command (send from the server) is actually valid.

(svn r13256) -Codechange: merge the OPTS and PATS chuncks.
-Codechange: split the diff_custom variable.
-Feature: allow changing some of the diff_custom variables via the console in network games.

(svn r12913) -Add: ability to backup and restore a player's economic data and data for a vehicle (or chain of vehicles)
Autoreplace uses this with the following benefits:
-Mass autoreplace (the button in the depot window) will now estimate costs correctly
-Autoreplace now either replaces correctly or manages to keep the original vehicle (no more broken trains)
Thanks to Ammler for testing this

(svn r12421) -Feature: [autoreplace] the autoreplace button in train depots will now also replace wagons even if they aren't connected to a locomotive
fixed estimated cost in CmdDepotMassAutoReplace() (will still not estimate wagon removal profits)
Made it possible to command CmdDepotMassAutoReplace() to either replace everything or nothing (the button will still happily replace just some of the vehicles if cash premits)