#24 SUBSTR for SQLServerPlatform

[Stefan Schmiedl]

SQLServer does not recognize SUBSTR as valid function name, adding SUBSTRING to the functions dictionary makes the test succeed.

SQLServerPlatform>>initializeFunctions
super initializeFunctions.
functions
at: #, put: (InfixFunction named: '+');
at: #copyFrom:to: put: (SubstringFunction named: 'SUBSTRING')