Remove weird/unused options from WM configuration

[dummylabs]

The following options will be removed from WM configuration dialog:

• notification action name
• notification action data
• notification message chunk size

Motivation: The logic behind them is somewhat cumbersome. Users may set and forget these action call parameters in the configuration, and they may interfere with the action call input data. Of course, they remain available as action parameters.

The following parameter will be removed from action input parameters:

• send_notification

Motivation: it becomes redundant since action parameter must be set anyway to invoke a notification action. It is still accepted by watchman.report action in 0.6.4 and will be deprecated/removed later.

[dummylabs]

Implemented in 0.6.4