interhg: allow more flexible pattern specification (fixes 2/3 of issue699) - something else than "pat" followed by a number can be used as key - something else than "/" can be used as delimiter - "ilmsux" flags (e.g. "i" for case insensitive) can be used

abort: repository a not found!
255
abort: error: Connection refused
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abort: repository a not found!
255
abort: destination '../a' already exists
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abort: repository a not found!
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destination directory: q
abort: destination 'q' already exists