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Initial revision
Implemented temporary factories to construct test indicators - macd, macd
signal, macd histogram, momentum, ma, ema, stochastic %K, %D, etc.  Classes
need to be partitioned into clusters, design needs to be cleaned up,
assertions added, design change made for cleaner function composition, etc.
Minor changes for "iteration 1" finalization
Removed valid_state, added initialize procedure
added initialize, changed export status of set_operands
added a precondition for execute.
changed numeric_command to inherit from MATH_CONSTANTS.
added postcondition for execute
math utilities
Data scanning, tuple manufacturing abstractions
cosmetic change
numeric_command: exported math_constants features to nobody.
command: added 3 deferred features and used these features in new pre- and
post-conditions of execute.
Most changes were related to the new pre and postconditions for execute in
command and the 3 new deferred features used to express these conditions.
Also, changed name of linear_sum to linear_operation to reflect the change
that it now uses an operator to operate on n elements, instead of simply
summing them.
TUPLE_FACTORY: added inheritance from factory. execute now takes an
argument.
DATE_SCANNER: Added an argument to call to tuple_factory.execute to
accomodate the above change.
abstraction for factory classes
DATA_SCANNER: fixes/modifications to execute routine; added inheritance
from FACTORY; added set_... features; etc.
VALUE_SETTER: added inheritance from MATH_CONSTANTS; Added features for
error reporting; added concept of a dummy setter, which will eat a field
from the input but will not set the value in the tuple.
Fixed assertions
added comments
added execute pre and post conditions features
minor debugging-related changes