Get a portfolio object conssting of either a nested list (
or a pointer to the portfolio in the
.blotter environment (
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string identifying portfolio
dates subset, not yet supported
the environment to retrieve the portfolio from, defaults to .blotter
Portfolios in blotter are stored as a set of nested, hashed, environments.
getPortfolio function returns a nested list. If you are unsure, use this function.
.getPortfolio function returns a pointer to the actual environment.
Environments in R are passed by reference, and are not copied by the
assignment operator. Any changes made to the environment returned by
.getPortfolio are global. You have been warned.