Changed testing such that longer running tests are not performed by default

tests/CMakeLists.txt

 enable_testing()
 
-set(Testdirs CuBulk CuBulkXML Fe_1l Fe_1lXML Fe-Atom CuBand CuBandXML CuDOS CuDOSXML Fe_bct_LO Fe_bct_LOXML Fe_bct Fe_bctXML NiO_ldau NiO_ldauXML PTO PTOXML Fe_fcc Fe_fccXML Bi2Te3 Bi2Te3XML Fe_1l_SOC Fe_1l_SOCXML PTO-SOC PTO-SOCXML Fe_bct_SOC Fe_bct_SOCXML) 
+set(Testdirs CuBulk CuBulkXML Fe_1l Fe_1lXML Fe-Atom CuBand CuBandXML CuDOS CuDOSXML Fe_bct_LO Fe_bct_LOXML Fe_bct Fe_bctXML PTO PTOXML Fe_fcc Fe_fccXML Fe_1l_SOC Fe_1l_SOCXML PTO-SOC PTO-SOCXML Fe_bct_SOC Fe_bct_SOCXML) 
+
+#Check if all tests (including those running for a long time) should be executed
+if (all_tests)
+    set(Testdirs ${Testdirs} Bi2Te3 Bi2Te3XML NiO_ldau NiO_ldauXML)
+endif()
+
+
+
 #The serial tests
 if (${FLEUR_USE_SERIAL})
-   #tests of fleur
    foreach(test ${Testdirs})
     add_test("FLEUR:${test}" ${CMAKE_CURRENT_SOURCE_DIR}/tests/test.pl ${test} "${CMAKE_BINARY_DIR}/fleur")
    endforeach(test)
@@ -11,9 +18,13 @@ endif()
 
 #The parallel tests
 if (${FLEUR_USE_MPI})
-   #tests of fleur
+   if (MPIEXEC)
+      set(mpi_exec "${MPIEXEC} ${MPI_NUMPROC_FLAGS} 2")
+   else()
+      set(mpi_exec "mpirun -n 2")
+   endif()
    foreach(test ${Testdirs})
     add_test("FLEUR_MPI:${test}" ${CMAKE_CURRENT_SOURCE_DIR}/tests/test.pl
-${test} "${CMAKE_BINARY_DIR}/fleur_MPI" "${MPIEXEC} ${MPI_NUMPROC_FLAGS} 2")
+${test} "${CMAKE_BINARY_DIR}/fleur_MPI" "${mpi_exec}")
    endforeach(test)
 endif()