Mark InsertTable SC_DLLPUBLIC, will need it in next commit

Change-Id: Ia105bc5348c3745398ea0e90cb142c3282d688f5
Re-factor the OpenCL quality test spreadsheet generating code

Be more elegant, avoid hardcoding stuff, use more C++ features.

(Not complete yet. Only did the math and trig functions and arithmetic ops so
far. New style test generation for AVERAGE, SUM etc not yet done. Old code
still left in #if 0 for reference.)

Change-Id: I50068852eacf7f0212b2a7ea077021713c8e9978