update with respect to change in function name
changed country extraction from FAOSTAT package to GetCodeList
changes to minor errors
 added roxygen
added roxygen and also changed arguement name and also added in requirement for input symbol
 added roxygen
added roxygen
added roxygen
moved filled balance to a new script, and added roxygen and replacement index
First commit of the fill balance function
rewrote the yearSearch function to replace only replaceable symbols and added roxygen and replacement index
added roxygen and improved the calculation with '+' to rowSums
rewrote the function
removed hard coded names, change arg names for data to be more meaningful, added roxygen and return replacement index