Importing Loan charges using Data Import Tool

[santoshconflux]

Reported by Daniel at https://mifosforge.jira.com/browse/MIFOSX-2187

Original Description:
I am exporting the loans with Data Import Tool, we have a charge called "death relief fund", it is about 60.00 lps per installment. How can I add this charge in the loan sheet using data import tool?
With existing Data import tool, I can only Add charge with charge time as "Specified due date". Other charge time is not yet supported.

[santoshconflux]

Right now, we can add charge using charge Id. The charge Id can be found in database under m_charge. The enhancement required is,while downloading 'Loan Import' sheet, the information about charge id, charge name should be in the excel sheet.