[DD-905] functions.sql extended with combine, choose, timestamp, dateformat
[DD-905] functions.sql extended with combine, choose, timestamp, dateformat

knutwalker/dswarm,zazi/dswarm,knutwalker/dswarm,janpolowinski/dswarm,philbritton/dswarm,dswarm/dswarm,janpolowinski/dswarm,dswarm/dswarm,zazi/dswarm,dswarm/dswarm,philbritton/dswarm,knutwalker/dswarm,zazi/dswarm,philbritton/dswarm