`subset`: support UTM coord while subsetting in latitude/longitude (#1464)

* Fix UTM coordinate conversion for subset latitude and longitude

* support lat/lon -> y/x for both WGS84 and UTM files: For files in WGS84, subset works using --lat or --lon alone, or using --lat/lon together; while for files in UTM, subset works ONLY when using --lat/lon together.

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Co-authored-by: Zhang Yunjun <yunjunz@outlook.com>