FIXED: Repaired failing test cases (DataObjectSchemaGenerationTest)
FIXED: Incorrect implementation of alterIndex
UPDATED: Improved parsing of index specification by including code borrowed from the postgres database connector module. Possibly a candidate for refactor into SS_Database.
Merge branch '3.0-index-fixes' of git://github.com/tractorcow/silverstripe-mssql into tractorcow-3.0-index-fixes