Method initialIndent

unittests/catch.hpp:5416–5419

            return *this;
        }
        auto initialIndent( size_t newIndent ) -> Column& {
            m_initialIndent = newIndent;
            return *this;
        }

        auto width() const -> size_t { return m_width; }
        auto begin() const -> iterator { return iterator( *this ); }