Added two new maths routines to the Code Snippets Database

Two new routines have been added to the Mathematics category of the Code Snippets database. The first, Pow, raises an integer to value to a non-negative integer power. The second snip is named SAR and performs an arithmetic right shift operation on an integer (Pascal's 'shr' is a logical left shift operator). Don't forget that new snippets now don't display in the old Code Snippets online viewer - you need the CodeSnip program or the new viewer at http://snippets.delphidabbler.com/cs to see them.
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