13.ALTER
Purpose:Command is used to change the value of a parameter.
Status:Implemented
Syntax:
    alter
    alter parameter-name value
Comments:Sets the value of specified parameter
Example:
To modify the value of vcc in a ciruit
    gnucap>alter vcc = 15
    gnucap>
and to modify the resitances say R1 and R2
     gnucap>alter R1=5k R2=100
     gnucap>