Fixed bug in r_string: end of string pointer was not updated in the force member function
Fixed bug in r_string: end of string pointer was not updated in the force member function

This could lead to undefined behaviour in the std::string conversion
operator, when using the iterator interface (begin() / end()), and the size()
member function.

ipkn/crow,shyblue/crow,ipkn/crow,shyblue/crow,ipkn/crow,shyblue/crow