Bug: Excel format CSV import with space before exercise rung

If an Excel-format CSV record contained a space before a single-digit exercise rung field, the record would be skipped as not parsable. I modified the test pattern to allow leading (but not trailing) spaces. Records of this type are created by the Palm HDread program when a day has an exercise rung between 1 and 9 and the -o option is used to generate Excel-format CSV. (Reported by Ömer Ay.)