install-sh script added

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rniftilib@66 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
new organization of configure scripts (aclocal -I.tools is required to create aclocal.m4 file)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rniftilib@67 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
further configure changes: add cleanup script

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rniftilib@68 edb9625f-4e0d-4859-8d74-9fd3b1da38cb