ColumnTypeString.
DescribeExpression.
IfNull.
No arg funcs.
Pad.
Repeat.
SequenceValue.
SerialSequence.
Substring.
TBinary.
TParsers.
merge MMcM: Remove some mcompat from elsewhere in types

Merge pull request #1170 from MMcM/sql-layer/less-common-funcs
https://github.com/FoundationDB/sql-layer/pull/1170