LONDON (Reuters) - Shares, commodities and the euro fell in early European trading on Wednesday as investors fretted about Greece's new debt deal and a lack of progress in U.S. budget talks. European shares on the FTSEurofirst300 opened down almost 0.4 percent, giving up the previous session's 0.3 percent gain. London's FTSE 100 , Paris's CAC-40 and Frankfurt's DAX were all down roughly 0.4 percent and the MSCI index of global stocks was down just over 0.2 percent following falls in Asian equity markets. ...