Added support for >, <, >=, <= operators
Useful when using CompareTo(...) on TimeStamp columns

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branch : GreaterThanSmallerThan
Made Timestamp implement IComparable to make [Index] attribtues work on
[Timestamp] columns in Effort.

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branch : TimestampIndex
Merge GreaterThanSmallerThan branch

--HG--
branch : BranchesCombined
Merge TimestampIndex

--HG--
branch : BranchesCombined
Merge with BranchesCombined
build script fix
release 1.0.1