Avoid std::cout and std::endl

[volkm]

Currently, some parts of the code are still using std::cout. We should revise them to use our custom macros such as STORM_LOG_INFO or STORM_PRINT_AND_LOG.

In addition, we opt to use \n instead of std::endl, see PR #178.
The files GradientDescentInstantiationSearcher.cpp and SparseDerivativeInstantiationModelChecker.cpp should be adapted accordingly.

[Shurtu-gal]

Hello,
I am Ashish Padhy (Sophomore at Bachelor's) and am kind of beginning my open source journey.
So can you please clarify how to choose the macro to replace std::cout .
Thanks for your help.

[tquatmann]

PR #277 addressed the two files you mentioned. Someone should check for other misplaces occurences of std::cout

@Shurtu-gal the macros allow us to control the tool output on a global level. For example, we could easily implement a compile-time option that disables all output.

[Legoeggolas]

If there are any other source files that require similar enhancements, I'd be very happy to help with them as well :D This issue helped me find a good example of macro use in a mature code base and I am grateful for that experience

[Shurtu-gal]

@tquatmann Thanks for the heads up.
Would be happy to contribute to other issues.