CRM-13927 - Counties: fix county notice and remove US county SQL file

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* CRM-13927: County notice gone missing
  https://issues.civicrm.org/jira/browse/CRM-13927
CRM-13927 - Counties: don't need to find path to county file

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* CRM-13927: County notice gone missing
  https://issues.civicrm.org/jira/browse/CRM-13927
CRM-13927 - Counties: link to local extensions directory in message

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* CRM-13927: County notice gone missing
  https://issues.civicrm.org/jira/browse/CRM-13927
Code cleanup
-- made financial account as required, CRM-14380

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* CRM-14380: Adding a new Payment Instrument does not require account, results in unbalanced transactions
  https://issues.civicrm.org/jira/browse/CRM-14380
fixes for CRM-14238

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* CRM-14238: Export of Membership drops Campaign ID and Campaign Title
  https://issues.civicrm.org/jira/browse/CRM-14238
Merge pull request #3131 from kurund/CRM-14238

fixes for CRM-14238
Merge pull request #3057 from agh1/counties-as-extensions

CRM-13927 fix county notice and point it to extensions
Merge pull request #3133 from eileenmcnaughton/CRM-14367

Tidy ups & test fixes preparatory to fix
Merge pull request #3134 from eileenmcnaughton/CRM-14367

CRM-14367 fix incorrect addition of separators before first string
Merge pull request #3136 from eileenmcnaughton/CRM-14367

CRM-14367 e-notice fix
Merge pull request #3137 from eileenmcnaughton/CRM-14367

test fix - typo in var
CRM-13966 - Migrate custom ContactReference fields to use select2
CRM-13966 - Remove legacy autocomplete plugin
CRM-13929 - Remove jQuery migrate
Merge pull request #3138 from colemanw/contactRef

js updates
CRM-14063-added attachment icon for comments that are children of notes
Merge pull request #3139 from leez/CRM-14063

CRM-14063-added attachment icon for comments that are children of notes
Merge pull request #3119 from pradpnayak/CRM-14380

-- made financial account as required, CRM-14380
now shows more than one attachment icon if comment has more than one