Added nobase_ for installed data in package Makefile.am to preserve directories, and so eliminate 'make install' error when multiple files of same name, but in different subdirectories, are installed.
Added nobase_ for installed data in package Makefile.am to preserve directories, and so eliminate 'make install' error when multiple files of same name, but in different subdirectories, are installed.

lawmurray/Birch,lawmurray/Birch,lawmurray/Birch