Install the file iteratortest.hh, because it gets used by tests in other modules.

This closes FlySpray task 804

[[Imported from SVN: r6412]]

dune/common/test/Makefile.am

@@ -76,6 +76,10 @@ check_PROGRAMS = $(TESTPROGS)
 
 noinst_HEADERS = dummyiterator.hh
 
+# Install some test headers, because they get used by tests in other modules
+testincludedir = $(includedir)/dune/common/test
+testinclude_HEADERS = iteratortest.hh
+
 # define the programs
 pathtest_SOURCES = pathtest.cc