Fix excessive realloc in DArray_pop #14
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Was reallocing on every pop except the one where it was supposed to realloc, basically every pop when the max was greater than the expand rate. I also changed the 1st condition when popping so that it correctly resizes to 301 now that it reallocs correctly.
I also added a couple checks to the tests so that after every push and pop it makes sure that max is a multiple of expand_rate + 1 (as long as we're just pushing/popping elements it should resize in increments of the expand_rate).