Provide a configure script which knows the version of config generator

Instead of copying a symlink file, resulting in a broken link, the
target file is copied instead, unless the target is in the same
directory, in which case the symlink is maintained.

The upcoming version of the config generator script package will need
more files to be copied into the build directory. This change simply
copies all files and does not rely on a particular structure.

this is required for dcmctrl7 config