Patches xu4 to accept a --save-path (or -savepath) argument specifying the path to party.sav. The default path is used if nothing is provided.
The new path is not saved to the config file; I'm unsure how to go about adding an entry to it without breaking backward-compatibility with older version of the file.
This patch was written using svn rev 2890 as the base, with 02-command-line-args-improved.patch (tracker id #3285269) applied!
It may fail to patch without the previous patch already applied.