new OS/X and Linux builds of MARK executable

Are now online (thanks to Brett McClintock for the OS/X compile). This is the latest version of all the numerical routines in MARK, and all users should update.
Details and files here: http://www.phidot.org/software/mark/rmark/linux/
Details and files here: http://www.phidot.org/software/mark/rmark/linux/