[roottest] add reference files for newstl test

One can add reference files to check that reading
remains working also for older files.

So add for beginiing reference files from 6-32-19 version.
Some older files can be add as well

Author: linev

roottest/.gitignore

@@ -488,18 +488,6 @@ AutoDict_*.cxx
 /root/io/newdelete/3-*
 /root/io/newdelete/ClassesDict.*
 
-# /root/io/newstl/
-/root/io/newstl/AutoDict*
-/root/io/newstl/pospelov
-/root/io/newstl/latest
-/root/io/newstl/3-*
-/root/io/newstl/4-*
-/root/io/newstl/5-*
-/root/io/newstl/6-*
-/root/io/newstl/7-*
-/root/io/newstl/*.root
-/root/io/newstl/ArchivedDataFiles
-
 # /root/io/perf/
 /root/io/perf/*.root
 

roottest/root/io/newstl/6-32-19/Readme.md

@@ -0,0 +1,14 @@
+# Test files created with ROOT 6-32-19
+
+After running
+
+    ctest -R roottest-root-io-newstl
+
+several root files are created in roottest/root/io/newstl directory
+
+With every new ROOT version one can commit such files into repository
+and add corresponding reading entry into cmake files.
+
+One should add files only from previous ROOT versions - otherwise
+log reference files will differ
+