Brought back default effect fading: (adding a wipe effect makes it wipe by default for the length of the strip) First round in upgrading IPOs from older versions. (works for non-IPO case now and sets at least the new "default effect fade"-flag) Still non-working for old IPOs, since Sequence-Strips aren't real IDs! And: non-frame-lock case should stretch the FCurve to the right length!