Updates to media-gfx/siftgpu:
- removed the check for CUDA (this gave false positive with Matlab)
- switched on the CUDA flag using the emerge cuda flag
Autofetch for the source files, filling in a mail form is no longer necessary.
Updates vsfm to version 0.5.24
Updated media-libs/pba to exclude the _no_gpu prefix from the library names. VisualSFM for example expects the names without this suffix and will break without the included patch for PBA
Merge pull request #49 from robberto/master

Updates to media-gfx/siftgpu: