Change HashTable algorithm to "Basic".

[kquick]

No description provided.

[kquick]

This addresses a performance regression in various SAW-script tests. Tests that the Cuckoo HashTable implementation could complete in 28 minutes take 88m with the Basic algorithm, but they take 10+ hours with the Linear algorithm.

[joehendrix]

So that it is captured somewhere, what is the bug that prevents using the Cuckoo implementation?

[kquick]

The issues with the cuckoo implementation were identified by @benjaminselfridge and @travitch ; I will have one of them provide updates here.

[travitch]

@benjaminselfridge noticed some cases where the hash table was not returning values that has been inserted. In our case, it led to getting spurious undefined values out of the table. I suspect that this is the issue: gregorycollins/hashtables#54. That is one of two pretty serious bugs open on the Cuckoo hash table that have been open for almost a year, so our feeling was that a fix is not imminent. I'd love to switch back when we can.

[joehendrix]

Thanks -- that's useful to know.