Removed MultipleExternalInput parameter and made it a subtype of MultipleInput
Removed references to OTB config parameters that are no longer used
[processing] Removed wrong method definition in ParameterTable.py
[processing] allow selection of open layers in batch interface
Modified plugin installer to avoid updating certain plugins

For those plugins that are modified in the Boundless distribution, they will not be listed as available from other repositories, but only from the Boundless one, preventing upgrading to a version of the plugin that does not contain the changes in the Boundless version
changed group name of example script