added unit tests of leja sampling using discrete variable types. Refactored unit test to encapsulate general utilities. Still need tests that test orthogonality of basis functions for all basis types as recently done by Russell Hooper for Meixner and Krawtchouk polynomials. These unit tests should sit in pecos though. Note need to check whether nightly test harness runs pecos unit tests
added unit tests of leja sampling using discrete variable types. Refactored unit test to encapsulate general utilities. Still need tests that test orthogonality of basis functions for all basis types as recently done by Russell Hooper for Meixner and Krawtchouk polynomials. These unit tests should sit in pecos though. Note need to check whether nightly test harness runs pecos unit tests

git-svn-id: d5469d78598a82f75b3d1e6419ce8b4d1ddac974@3898 aa0779c3-6ec2-4b84-a212-a405c134cd8d

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