CCP4 on Fedora 12

Now Tcl/Tk tools are bundled with Fedora 12, and they work well for CCP4i/imosflm.

Install tcl, tk, blt, itcl, itk, tkimg, tcl-tktreectrl, iwidgets, and tdom packages and set $CCP4I_TCLTK to /usr/bin.