running out of enthusiam for debugging this, lets just get it into master so we can prevent even more damage

Add external storage of temporary results for MVStore mode

Fix sorting with distinct in ResultTempTable

since the test() method already ignores anything except pagestore

Add support for INSERT IGNORE from SELECT in MySQL Mode

which results in (as far as I can see) quite a few cases where we now pick the faster option of an index instead of scanning over the pagestore table data

Minor cleanup and formatting fixes

Improve test scripts