Updated the makefile (less verbose)

Makefile

 	cd $(graphviz_images_path); make
 
 refreshdyn:
-	python refreshdyn.py &>/dev/null
+	python refreshdyn.py >/dev/null
 
 #
 # Cleaning rules
 
 # Documentation cleaning
 cleandoc:
-	-rm -Rfv ./doc/html ./doc/doxygen_sqlite3.db
+	-rm -Rf ./doc/html ./doc/doxygen_sqlite3.db
 
 cleandocimages:
 	cd $(graphviz_images_path); make clean
 
 # Python cleaning
 cleanpyc:
-	-find ./ |grep -E "\.pyc$$" |xargs rm -fv 2>/dev/null
+	-find ./ |grep -E "\.pyc$$" |xargs rm -f 2>/dev/null
 cleanpycache: cleanpyc
-	-find ./ -type d |grep '__pycache__' | xargs rmdir -fv 2>/dev/null
+	-find ./ -type d |grep '__pycache__' | xargs rmdir -f 2>/dev/null
 
 cleandyn:
 	-rm leapi/dyn.py