Hugin 0.7 beta 1 release

New assistant tab considerably simplifies stitching, especially for new users. The preview window offers interative centering and rotation as well as an automatic straighten function.

Newsworthy changes in 0.7
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* Assistant panel, enables 3 click stitching (well, almost ;-)
* Center and rotate panorama by mouse clicks in preview window.
Also added a numerical transform dialog
* automatic straighten
* support for Lambert and Lambert Azimuthal projections
* Rotated display of images in control point selector, depending
on the roll value
* allow images with and without alpha channels in the same project
* many small bugfixes
* removed image center dialog