Upadate SimpleLauncher class to warn user #3180
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Description
Please include a summary of the change and (optionally) which issue is fixed. Please also include
relevant motivation and context.
Updated the SimpleLauncher class to throw a warning when a user tries to use more than one node per block. Advanced users do not get a warning if they set permit_multiple_nodes=True. This PR fixes issue #3161
Changed Behaviour
Which existing user workflows or functionality will behave differently after this PR?
Users who are not advanced users will now get a warning when they try to use more than one node per block. Advanced users will not get a warning if they set permit_multiple_nodes=True.
Fixes
Fixes # (issue)
#3161
Type of change
Choose which options apply, and delete the ones which do not apply.