* 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