translate finder metadata to xml/exif
prototype, fully documented, partly tested, no safety!
Use at your own risk, may corrupt data!
used on mac os 10.9.5
adds finderTags to existing Adobe "keywords" without adding duplicates
overwrites the Adobe description with the finder/spotlight comment
you need to Install Tag from https://github.com/jdberry/tag/ and also install ExifTool from http://www.sno.phy.queensu.ca/~phil/exiftool/.
Based on an answer/question/work from Bruce Atkinson and damienfrancois http://stackoverflow.com/questions/30667174/bash-script-that-exports-apple-tags-mavericks-tags-to-iptc-keywords-metadata/42581865#42581865
and additional information by heim dutt https://techknowmore.wordpress.com/2014/11/20/applescript-get-file-information-as-shown-in-get-info/