Make changes to base line object class based on invoice line object.
@line_number reader -> @line_number accessor
@line_id -> .line_id reader method
Replace all references to @line_id with line_id (method call)
Update line object spec for new capabilities
Update subline object and spec
subline object is now indefinitely extensible via use of the .parent_line method
Update invoice line item to use new subline object class
Update invoice line to use base line object class
Update invoice current item to use base line object class
Remove invoice line object from lib/olefs/common
Remove invoice line object spec from spec/olefs/
Remove OLEFS & OLELS Line Objects
Move "set sublines if defined" call to initialize in common Line Object
Remove Create Subline & Remove Subline from common objects
OLEFS - Purap Document
OLELS - E-Document
OLELS - Editor
Correct typo in QA Helpers module
Implement new line & subline objects
Update Invoice line objects
Convert Invoice to new line object structure
Move invoice line item to olefs/subobjects
Convert OLEFS Line Item to new format
Convert OLEFS Accounting Line to new format
Convert OLEFS Notes Line to new format
Convert OLEFS Copies Line to new format
Move new purchasing line item elements to OLEFS PURAP Document