DOMjudge / checktestdata / 70

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travis-ci

Add cache member variable to parse_t.

Improves performance #3.

On the problems ascendingphoto and factorfree from NWERC 2017
this speeds things up about 10% and 40% respectively. This cache
may especially help if the checktestdata script contains constant
expressions like "INT(1,5*10^6)" where the 5*10^6 would previously
incur performing exponentiation and multiplication every time the
command was executed.

25 of 25 new or added lines in 1 file covered. (100.0%)

1130 of 1334 relevant lines covered (84.71%)

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