Merge pull request #1589 from nabinhait/v4-hotfix

V4 hotfix
Remove India specific fields
Additions to remove India specific fields
Merge pull request #1590 from anandpdoshi/remove-india-specific-fields

Remove India specific fields
Maintenance schedule: get no of visits and period validation. Fixes #1591
Merge branch 'develop' of github.com:frappe/erpnext into v4-hotfix