ScyllaDB release: version 1.2.4

ScyllaDB 1.2.4, a bugfix release of the ScyllaDB 1.2 stable branch, was announced by the ScyllaDB team on August 26, 2016. This release maintains backward compatibility and supports rolling upgrades, addressing several issues such as rare cases of range queries causing core dumps, excessive CPU consumption when compiled with certain versions of Boost, and limitations in performance due to disk bandwidth constraints rather than IOPS. It also resolves problems related to table creation using Thrift with dynamic column families that hindered insertions via CQL. Key contributors to this release include Avi Kivity, Duarte Nunes, Paweł Dziepak, Pekka Enberg, and Piotr Jastrzebski, who made significant improvements such as preserving DMA alignment, ensuring dense schemas are correctly upgraded, fixing iterator invalidation, and addressing access bugs in the storage proxy.