remove libtiff dependance from Xrecon (#159)
remove libtiff dependance from Xrecon (#159)

Newer versions of CentOS do not have this library. The code that
uses libtiff is still present but not compiled. There is a flag
in the SConstruct to compile it.
OpenVnmrJ/OpenVnmrJ,OpenVnmrJ/OpenVnmrJ,OpenVnmrJ/OpenVnmrJ,OpenVnmrJ/OpenVnmrJ,OpenVnmrJ/OpenVnmrJ,OpenVnmrJ/OpenVnmrJ,OpenVnmrJ/OpenVnmrJ,OpenVnmrJ/OpenVnmrJ,OpenVnmrJ/OpenVnmrJ,OpenVnmrJ/OpenVnmrJ