Hugin 0.7 beta 4 released

This release supports all new projections in libpano13. The windows package contains the latest panotools build as well as Enblend 3.0.

Newsworthy changes in hugin 0.7 beta 4
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* update panotools to latest version
* Albers equal area conic and Miller cylindrical projection
* Support for straight line control points
* Fixed running of Autopano-SIFT integration on windows
* (linux) work around bugs in wxWidgets (fixes double deletion
of control points when pressing the Del key)
* Force even values for width for 360 degree equirectangular
panoramas.