add.order               Adds an order to the LOB
ghfd_build_lob          Building LOB (limit order book) from orders
ghfd_download_file      Downloads a single file from Bovespa ftp
ghfd_get_HF_data        Downloads and aggregates high frequency trading
                        data directly from the Bovespa ftp
ghfd_get_available_tickers_from_file
                        Function to get available tickers from
                        downloaded zip file
ghfd_get_available_tickers_from_ftp
                        Function to get available tickers from ftp
ghfd_get_ftp_contents   Gets the contents of Bovespa ftp
ghfd_read_file          Reads zip file downloaded from Bovespa ftp
                        (trades or orders)
ghfd_read_file.orders   Reads zip file downloaded from Bovespa ftp
                        (orders) - INTERNAL USE
ghfd_read_file.trades   Reads zip file downloaded from Bovespa ftp
                        (trades) - INTERNAL USE
organize.lob            Organizes LOB (internal function)
print.lob               Prints the LOB
process.lob.from.df     Process LOB from asset dataframe
