Current-directory issue when editing multiple files

[Richard Stanton]

If I open a python script file in one directory, an *IPython* buffer opens. If I then open another script file in a different directory and press C-c C-c, the same *IPython* buffer is used to execute the file, but it still views the current directory as being the directory the *first* script file was in. So, for example, if the new file tries to import another file in the same directory, it results in an error.