updated CmakeLists  files  to support  "local_install"  vs  rez install
If you override  CMAKE_INSTALL_PATH  with a custom output path, it will  output the defaults
but if you leave the default  /usr/local  it will   remap it to install into a build  dir in the  top level partio src
and put the  platform types and  versions into the  subdirs  the way I  want  to continue to release partio to the public