XLALCWMakeFakeData(): check TS alignment and ensure transient signals are aligned
Last one of the commits suggested by Reinhard Prix in #275 (closed). I think this solves the problem on the (t)CW side independently from !1289 (closed), but I didn't get around to producing a specific test case yet. Posting for comments from @karl-wette already; specifically, as in !1289 (closed) I also wonder here whether we should be more careful about the end time / TS duration as well.
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Looks sane; test will be added.