CMakeLists: Support gcc-4.4 with old -ftemplate-depth option syntax
MinGW compatibility fixes (report by Sebastian Maile)
Merge branch 'gcc-4.4-ftemplate' of https://github.com/stuarteberg/vigra
fixed type in gaussianGradientMagnitude() documentation
vigranumpy: added 1D smoothing filter
Merge branch 'master' of https://github.com/BSeppke/vigra into bseppke
added missing #include
fixed a few warnings
replaced tabs with 4 spaces
added a correlationFFT prototype and calling functions according to the convolveFFT environment.
re-factored the correlation framework, so that the pure correlation itself is implemented by means of an FFTW-Plan like it has already been demonstrated for the convolution. Adapted the tests and the normalized correlation variant to use the new functionality and added zero padding features to the functions.