Add ability to run as a ctest -S script also

Then, use ctest_sleep to separate uploads by at least one
second each, so that the files on the web server all get
distinct time stamps.

Then, when viewed on the web server, sorted by time, they
are also sorted alphabetically.

Utilities/Release/upload_release.cmake

@@ -1,4 +1,7 @@
-set(PROJECT_PREFIX cmake-)
+set(CTEST_RUN_CURRENT_SCRIPT 0)
+if(NOT DEFINED PROJECT_PREFIX)
+  set(PROJECT_PREFIX cmake-)
+endif()
 if(NOT VERSION)
  set(VERSION 2.8)
 endif()
@@ -18,11 +21,18 @@ foreach(file ${FILES})
     message("upload ${file} ${UPLOAD_LOC}")
     execute_process(COMMAND 
       scp ${file} ${UPLOAD_LOC}
-      RESULT_VARIABLE result)  
-    math(EXPR count "${count} + 1")
+      RESULT_VARIABLE result)
     if("${result}" GREATER 0)
       message(FATAL_ERROR "failed to upload file to ${UPLOAD_LOC}")
     endif()
+
+    # Pause to give each upload a distinct (to the nearest second)
+    # time stamp
+    if(COMMAND ctest_sleep)
+      ctest_sleep(2)
+    endif()
+
+    math(EXPR count "${count} + 1")
   endif()
 endforeach(file)
 if(${count} EQUAL 0)