by Christophe VOGT Agence France-Presse WASHINGTON, United States (AFP) — IBM said Sunday it has reached a deal to buy open source software company Red Hat for $34 billion, among the biggest tech mergers in history which the computing giant said would enhance its cloud offerings. If approved it will be the third biggest tech merger in history, according to business news site CNBC. Red Hat said it was the biggest involving a software company. […]