Merge pull request #256 from jasvir99/dirty

Links updated on index page.
Merge pull request #257 from jasvir99/dirty

add distance template modified.
Forms created for change request
Models created for change request information
urls added for request_change.py
view created for change request form
views created for value change in it
Template for request form
Template for value change for request
Validation on forms
Validation on forms updated
Merge pull request #259 from haramrit/dirty

Validation on forms
Merge branch 'dirty' of https://github.com/GreatDevelopers/LibreHatti into dirty
Script for dynamic update of sum field
Script added
unwanted function deleted
id added for fields and function updated
Merge pull request #260 from aseemmittal/dirty

1 Rs. problem solved