bug 1596: moved pencil beam paper sources to 'europar' subdir as a working name

.gitattributes

@@ -2316,12 +2316,12 @@ doc/papers/2010/ppopp/round-robin.svg -text
 doc/papers/2010/ppopp/sig-alternate.cls -text
 doc/papers/2010/ppopp/sigplanconf.cls -text
 doc/papers/2010/ppopp/transpose.fig -text
-doc/papers/2011/Makefile -text
-doc/papers/2011/llncs.cls -text
-doc/papers/2011/llncs2e.zip -text
-doc/papers/2011/lofar.bib -text
-doc/papers/2011/lofar.pdf -text
-doc/papers/2011/lofar.tex -text
+doc/papers/2011/europar/Makefile -text
+doc/papers/2011/europar/llncs.cls -text
+doc/papers/2011/europar/llncs2e.zip -text
+doc/papers/2011/europar/lofar.bib -text
+doc/papers/2011/europar/lofar.pdf -text
+doc/papers/2011/europar/lofar.tex -text
 doc/papers/references.bib -text
 /lofar_config.h.cmake -text
 /lofstorman -text