* Central bank head says budget based on too-rosy outlook * Spain's borrowing costs fall at auction * Markets bet on a rescue application from PM Rajoy * Euro zone considers debt insurance scheme for Spain * ECB's Draghi says conditions must be met for aid By Carlos Ruano and Nigel Davies MADRID, Oct 4 (Reuters) - Spain's central bank chief undercut the government's proposed 2013 budget on Thursday, saying it was based on over-rosy forecasts for economic growth and tax revenue. Speaking to a parliamentary budget committee, newly-appointed Central Bank Governor Luis Maria Linde delivered a blunt message as Prime Minister Mariano Rajoy weighs when to seek an international bailout. "This...
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