Re: [w3c/IndexedDB] Feature Request: Allow batch adding records (from an Array) (#69)

In addition to putAll, please also consider batch add/delete. Off the top of my head, something like a couple of these:

* store.addAll(sequence<value> values) - like store.putAll but error if keys exist
* store.deleteAll(optional range) - like store.clear() but limited to range
* store.clear(optional range) - if no range then behave like now, if range then limit deletes to range
* index.deleteAll(optional range) - limited to store objects referenced by the the index that are within range.

The missing functionality is basically `DELETE FROM store WHERE ...`. As a trivial example, I am working on a simple rss app with stores feeds and articles. When unsubscribing, I open a rw tx over both stores, then delete feed from feeds and articles from articles where article.feedId = feedId. To delete the articles, I must first open a cursor over an index on article.feedId with IDBKeyRange.only(feedId), or use getAll or getAllKeys, then I must iterate over the articles and issue individual deletes. It would be nicer to skip the getAllKeys step, and use a single batch delete request that accepts a range.

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