b3270 register operation

### register Operation

Register a pass-through action.

Attribute | Required? | Purpose
--- | --- | ---
name | yes | Action name
help-text | no | Help text
help-params | no | Help parameters

Name is the name of the action to register.

The help-text and help-params are displayed by the Help() action.

Example:

     <register name="ChangeKeymap" help-text="Switch keymaps" help-params="&lt;keymap-name&gt;"/>

b3270: Protocol - Operations - Indications