Avoid unsigned comparison with 0 warning.
-rw-r--r-- 65 AUTHORS
-rw-r--r-- 3557 CHANGELOG
-rw-r--r-- 14093 CMakeLists.txt
-rw-r--r-- 26527 COPYING.LIB
-rw-r--r-- 873 GOALS
-rw-r--r-- 2281 Mainpage.dox
-rw-r--r-- 2934 README
drwxr-xr-x - cmake
drwxr-xr-x - dox
drwxr-xr-x - examples
drwxr-xr-x - scripts
drwxr-xr-x - templates
drwxr-xr-x - textdocument