Optimize input terminal qx for one life table based on given terminal mx and
age pattern.
     
    
    
    Arguments
    - dt
 
[data.table()]
A single life table to optimize.
 
- ax_params
 
[data.table()]
Table of ax regression parameters for caclulating ax.
 
 
    
    Value
    
[data.table()]
A copy of dt with a new column appended with the qx solution.