increment the rev. number to 0.4.3 as a preparation for the forthcoming release
increment the rev. number to 0.4.3 as a preparation for the forthcoming release


Former-commit-id: c08bbfb0d158e46bedeaca0596353b14ec48f857
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine