jList: Performance improvements when removing duplicates

Version 1.2.0 of jList brings performance improvements to the two most recently added functions listRemoveDuplicates and listRemoveDuplicatesNoCase. These now run about 30% faster than before though you are unlikely to notice the gains unless you are working with very large lists (100,000+ elements) or running it many times consecutively.

I intend to post later this week about efficiently removing duplicates from Javascript arrays so I shall cover what changes I made in more detail as part of that post.

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