Add Line and Column output to ini validator

[kehoecj]

Description

There is currently no way to calculate line and/or column number in the error output when using the go-ini library to validate .ini files. We would like to add the functionality to the go-ini library - tracked here. Once the library supports it, the ini validator needs to to be updated to calculate the line/column of the parsing error and output a custom error. If the solution in go-ini is to output the line/column as part of the error then there will be no additional action in this story