Build improvements for GlueX software

Generated from reviewing the build script at http://www.jlab.org/Hall-D/software/wiki/index.php/Example_build_script .

• benchmark/tagged/static releases, Jana and GlueX
• Use GLUEX in environment variable names in favor of HALLD?
• rename OSNAME to GLUEX_OS
• decide on proper parameters to encode in GLUEX_OS
• eliminate need to do a “make clean” when first trying to build a jana release
• standard set-up script for jana/gluex