loads of changes:
- simplify the Point class (simple struct tuple-type)
- get rid of newCacheWithPointRecord (redundant)
- get rid of isPointAvailable (not needed)
- speed up points() methods on several TS classes
- generalize ScadaPointRecord to ODBC with settable syntax
clean up buffer point record (use Point class rather than intermediate data structures)
fixed major point operator bug
improved resampler points() method
adding data access profiler code