* Adding dnn based super resolution module.
* Fixed whitespace error in unit test
* Fixed errors with time measuring functions.
* Updated unit tests in dnn superres
* Deleted unnecessary indents in dnn superres
* Refactored includes in dnn superres
* Moved video upsampling functions to sample code in dnn superres.
* Replaced couts with CV_Error in dnn superres
* Moved benchmarking functionality to sample codes in dnn superres.
* Added performance test to dnn superres
* Resolve buildbot errors
* update dnn_superres
- avoid highgui dependency
- cleanup public API
- use InputArray/OutputArray
- test: avoid legacy test API