Add new fields to borrower registration form

Add the community_leader…, family_member… and neighbours… fields
Fix php notices
Use new borrower_extn fields in $session
Update $process->subRegBorrower
Add new borrower_extn validation
Refactor error redirect in subRegBorrower
Update addBorrower to use new borrower_extn fields
Remove legacy code
Add new fields to edit profile page
Use borrower_extn fields in $seesion->editprofile_b
Add new borrower_ext validation to validateBorrowerEdit
Update $updateProcess->subEditBorrower
Refactor error redirect in subEditBorrower
Fix typo
Add $database->_updateBorrowerExtn and use it in $database->updateBorrower
Update borrowers_extn schema
Add _sanitizeBorrowerExtn
Sanitize mobile phones
Fix checkMobile validation

`eregi` is deprecated
Check for duplicate phone numbers