Needed to compile on Ubuntu Xenial with qtbase5-dev:amd64 5.5.1+dfsg-16ubuntu7.5
Specify return type in declaration
Avoids compile error with GNU c++ (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609: src/main.hpp:150:19: error: ISO C++ forbids declaration of ‘change_coloring’ with no type [-fpermissive]
Fix case of headerfile inclusion
Needed to compile on Ubuntu Xenial with qtbase5-dev:amd64 5.5.1+dfsg-16ubuntu7.5
Specify return type in declaration
Avoids compile error with GNU c++ (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609: src/main.hpp:150:19: error: ISO C++ forbids declaration of ‘change_coloring’ with no type [-fpermissive]