replace-regexp-in-string used in semanticdb.el and similar uses

Hi, out of curiosity I looked into the 'JDE 2.3.2 fixes' Andy Piper posted yesterday. I found, that he defines replace-regexp-in-string which is not defined in XEmacs. That reminds me that this function is also used by semantic in the semanticdb.el file, but only if the variable semanticdb-default-save-directory is set. Maybe other files are using replace-regexp-in-string, too. I think it should go into a more basic package. On a similar note: ECB uses a bunch of functions new in Emacs 21 to get information about the window layout like window-edges. These are used, to make a nice layout of buffers in a frame. There is at least another file (planner-browser.el) which uses those methods, too. For now I just required ecb-utils and call the ecb functions there. I think these are also good candidates for putting into XEmacs. Gerd