* Calls software "closed," questions reliability* Flash not compatible on iPhone, iPad * Adobe shares fall 2 percent, Apple up 2.4 pct SAN FRANCISCO, April 29 (Reuters) - Apple Inc (AAPL.O) Chief Executive Steve Jobs on Thursday called Adobe Systems (ADBE.O) Flash multimedia software a "closed system" that is ill-suited for the company's suite of mobile devices, escalating the war of words between the two companies. Jobs said Flash's system is closed because it is a proprietary system from Adobe, which controls everything from its features to its pricing. Ironically, perhaps, similar charges have been lobbed at Apple's products...