Liberty Global’s latest financial filing serves as a reminder of the group’s’ pedigree as a rising converged network powerhouse, as well as issuing a warning to rivals and regulators that Liberty Global is not done buying and selling its way around Europe – not by a long shot. To condense Liberty Global’s extensive financial documents into a single paragraph – a successful MNO venture has just been added to the arsenal in Switzerland with the acquisition of Sunrise, while the deal for UK-based mobile operator O2 could close in the next quarter. Operationally, the business added almost a quarter of a million broadband subscribers and over half a million mobile customers across its footprint last year. Still, profitability was just…