creates a copy of a portfolio, stripping all history (transactions etc)
clone.portfolio(portfolio.st, cloned.portfolio.st, strip.history = TRUE,
src_envir = .blotter, target_envir = .blotter)
string identifying the source portfolio
string naming the target portfolio
boolean, default TRUE, whether to remove all transaction and portfolio history, keeping only the structure (e.g. assets)
environment to get the portfolio to be cloned from, default .blotter
environment to put the cloned portfolio in, passed to put.portfolio