TRUNK-4122, 4123, 4124 - Mujir/Sushmita
1. added order_number to orders
2. added previous_order to orders
3. added action to orders

TRUNK-4123, 4124 - Mujir/Sushmita - Incorporating feedback from Wyclif, undoing changes for introducing order number

TRUNK-4125 - Mujir/Sushmita - introducing structuredDosing in drugOrder to replace complex

TRUNK-4125 - Sushmitha - implementing feedback

TRUNK_4124 | sushmitharaos | corrected the hibernate mapping to the right column name

Arathy | TRUNK-4125 Rename drug_order.complex to drug_order.dosing_type and introducing enum for dosing types

Arathy | TRUNK-4125 | incorporating comments
Resolved conflicts - TRUNK-4123, 4124, 4125
Resolved more conflicts - TRUNK-4123, 4124, 4125

applied auto format changes