* old style raise --> raise() for Python 3
* old style exception --> new style for Python 3
* old style exception --> new style for Python 3
* old style exception --> new style for Python 3
* old style exception --> new style for Python 3
* old style exception --> new style for Python 3
* old style exception --> new style for Python 3
* old style exception --> new style for Python 3
* old style exception --> new style for Python 3
* old style exception --> new style for Python 3
* old style raise --> raise() for Python 3
* old style raise --> raise() for Python 3
* old style exception, raise --> new style for Python 3
* Production Order Enhancements
- Show required items child table
- Source warehouse for each raw materials, in Pro Order Item and BOM Item table
- Group warehouse allowed for source and wip warehouse
- Patch to populate required items, to fix status and reserved qty for stopped pro order
- Cleaned up existing codes
- Test cases
* Set available qty in source and wip warehouse
* minor fix in bom query naming
* Minor Fixes
* Reload BOM doctypes in patch
* [enhance] Added account in the warehouse
* documentation
* patch to move account head from account to warehouse
* fixed test cases
* Fixes in warehouse-account linking
* minor fix in test case
* [Fix] Orders not creating from the POS for new customer if customer name is based on naming series
* [fix] Disabled price field in POS, if Allow User to Edit Rate field is disabled in POS profile
* added customer name in the search bar of the customer
* search customer by phone number and email id in the POS
* adds Material Request to `status_map`
* updates eval condition for Partially Ordered in Material Request map
* changes material_request doctype to include "pending", "ordered", "partially ordered", "issued", "transferred" as options
* adds more options to `validate_status`
* adds `set_status` just before saving
* adds `check_for_closed_status` in `before_cancel`
* adds patch to convert status to material request specific status
* adds stricter status update conditions
* changes `update_status` to me `set_status`
* adds checker such that draft status can only change to pending
* renames `check_draft_status` to `status_can_change`
* adds Cancelled to Material Request map
* makes `status_can_change` block any attempt to change a cancelled document
* adds more test cases
* updates what `set_status` checks for before adding comment
* adds patch to rename the present material request status
