Fixed typos in comments
Double precision for solvePnPRansac()

solvePnPRansac() and pnpTask() now accept object or image points with double precision.
Added cast and removed formatting error
Fixed C++11 compatibility warning
Revert changes by PR#2930 since it breaks logic of inverse mode.
bug fix 3381
bug fix 3381
Clarified DescriptorExtractor::compute
Merge pull request #2898 from PhilLab:2.4
Merge pull request #2980 from akarsakov:revert_dft_dst_fix
Merge pull request #2984 from cambyse:2.4
Merge pull request #2948 from PhilLab:patch-1