Work with date index in tests

Consequence of commit 664f62bb.

Overlap/Tests/Input/NSODS_in.txt

-&MAIN_NML max_delta = 3, k_test_1 = 20454, k_test_2 = 20455 /
+&MAIN_NML max_delta = 3 /
 /
 /

Overlap/Tests/Input/NSO_delta_in.txt

- &MAIN_NML MAX_DELTA       = 2, k_test_1 = 20454, k_test_2 = 20455 /
+ &MAIN_NML MAX_DELTA       = 2 /
 ,,,,,,1
 ,,,,,,1

Overlap/Tests/Input/SODS_in.txt

- &MAIN_NML k_test_1 = 20454, k_test_2 = 20455 /
+ &MAIN_NML /
 /
 /

Overlap/Tests/Input/global_NSO_in.txt

-&MAIN_NML max_delta = 3, k_test_1 = 20454, k_test_2 = 20455 /
+&MAIN_NML max_delta = 3 /
 /
 /

Overlap/Tests/Input/global_successive_overlap_in.txt

-&MAIN_NML k_test_1 = 20454, k_test_2 = 20455 /
+&MAIN_NML /
 /
 /

Overlap/Tests/Input/non_successive_overlap_in.txt

-&MAIN_NML max_delta = 3, k_test_1 = 20454, k_test_2 = 20454 /
+&MAIN_NML max_delta = 3, k_test_2 = 0 /
 /
 /

Overlap/Tests/Input/region_5_NSO_in.txt

- &MAIN_NML max_delta = 3, k_test_1 = 20454, k_test_2 = 20455 /
+ &MAIN_NML max_delta = 3 /
 /
 /

Overlap/Tests/Input/region_5_SOR5_in.txt

- &MAIN_NML k_test_1 = 20454, k_test_2 = 20455 /
+ &MAIN_NML /
 /
 /

Overlap/Tests/Input/successive_overlap_in.txt

- &MAIN_NML k_test_1 = 20454, k_test_2 = 20454 /
+ &MAIN_NML k_test_1 = 1 /
 /
 /

Overlap/Tests/Input/successive_overlap_periodic_in.txt

- &MAIN_NML DIST_LIM        = 4 k_test_1 = 20454, k_test_2 = 20454 /
+ &MAIN_NML DIST_LIM = 4,k_test_2 = 0 /
 /
 /