By Tom Wilson and Tom Westbrook LONDON/SINGAPORE (Reuters) -Bitcoin was heading on Friday for its worst week since February, while dogecoin leapt by a quarter, as the latest tweets on cryptocurrencies from Tesla boss Elon Musk sent the digital coins on a wild ride. Bitcoin is down about 13% this week, and was last up 1.6% at $50,503. It has slumped over a fifth from its record of just under $65,000 hit last month. Cryptocurrency markets have gyrated to Musk tweets for months, with his comments on dogecoin – a token started as a joke that has scant practical use – fuelling a hundred-fold rally …

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