removing function that was added some time ago just for backwards compatibility with older versions of PostgreSQL

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extra : source : c8d87eb7bd526ea31f478aa7390e33b0269564ab
removing unused functions

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extra : source : c5194f327db2a2182b17032222d7e543c71f325a
Merge pull request #557 from einhverfr/master

removing unused code