Finish #491: Add KLS5-CR1220-01 Battery Holder

This replaces #491

Datasheet: http://www.klsele.com/admin/product_upload/20151124100234KLS5-CR1220-01.pdf

screenshot of the fixed footprint:

The area covered by the spring is not really included in the drawing. So i measured it directly from the dimensioned drawing. (Using pdf scaling and a caliber on the monitor.) I added a lot of tolerance to what i determined and drew it that way. (The vertical line is elongated by 2mm and connected to the normal octagon outline.)