set_checkout_branch
Description:
Gives the name of the branch to checkout.
null means use the remote's HEAD.
Parameters:
| this | 
           a CloneOptions.  | 
      
| checkout_branch | 
           the name of the branch to checkout or null.  | 
      
Gives the name of the branch to checkout.
null means use the remote's HEAD.
| this | 
           a CloneOptions.  | 
      
| checkout_branch | 
           the name of the branch to checkout or null.  |