Log Message:
-----------
Pass more tests by supporting more edm functions and better variable substitution
Modified Files:
--------------
Npgsql2/src/Npgsql/SqlGenerators:
SqlBaseGenerator.cs (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/SqlGenerators/SqlBaseGenerator.cs.diff?r1=1.5&r2=1.6)