Fix toOrdinal() and the test for Dutch #63
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The way the suffix for Dutch ordinals is calculated didn't give the right results for certain numbers.
The test in test_toOrdinal_dutch.R contained the wrong suffix for the numbers 0, 10, 22:27 and 29.
One of the tricky bits is that the suffix for 0 ('de') differs from the suffixes for 100 ('ste').
I rewrote the logic for calculating the suffix and added some comments.
I also added a test for some numbers >= 100.