* add new fields to Supplier Master:
- on_hold: To signal the Customer is blocked from completing certain transactions
- hold_type: 3 options - All, invoices and payments
* sanitize `on_hold` field input
* show hold status in list view
* add `release_date` field to Supplier Master:
- specifies the date when transaction restraint will be removed
* reset release date if supplier is not on hold
* add validation to stop transactions when Supplier is blocked
* add test cases
* return empty list for outstanding references if supplier is blocked
* block make button:payment if supplier is blocked
* adjust test cases
* PEP 8 clean up
* more tests
* adds new fields to Purchase Invoice:
- release_date: once set, invoice will be on hold until set date
- hold_comment: so user can add comment pertaining to why invoice is on hold
* implement individual purchase invoice on hold logic
* allow user to change release date
* update manual
* final cleanup including more validation and tests
* update supplier manual
* make default for release_date argument todays date
* remove Auto Repeat added by mistake
* add on_hold_field to purchase invoice
* add 'On Hold' or 'Temporarily on Hold' status for purchase invoice in list view
* implement explicit payment hold in purchase invoice
* update manual
* add dialog for saving comment
* bug fix, refactor, clean up
* more test cases
* Clinical Procesdure Template and Clinical Procedure Doctype
* Consultation - Create procedure and procedure prescription
* Patient Appointment - Create Procedure and Procedure appointment invoice
* Physician Schedule - Validate slot overlap
* Clinical Procedure Item - batch_no for Clinical Procedure not for Template
* Clinical Procedure - manage item batch_no
* Codacy - fixes
* Yet another Codacy and travic-ci fix
* Codacy - fixes
* Clinical Procedure - Codacy fix
* Permissions updated
* fixed Qty Indicators, Minor fixes
* Patient appointment for procedure prescription
* Doctype Patient Service Unit to Healthcare Service Unit
* Add healthcare service unit tree root
* Healthcare Service Unit - Tree view script
* Healthcare Service Unit - allow appointments check
* Clinical Procedure - remove unused variable
* Clinical Procedure - Get actual quantity from ledger - fix
* Clinical Procedure - apply transilation for message
* Warehouse in Healthcare Service Unit
* Service Unit in Clinical Procedure
* Codacy fix
* Missing semicolon
* Replace frappe.db.sql to frappe.get_list to apply permission
- All get_children method had frappe.db.sql in them which
had no permission check, now its replaced with frappe.get_list
which will check permission based on the user.
* Fix codacy
- Remove trailing whitespace
