Add Probots: Stale and Lock

.github/lock.yml

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+# Lock bot: https://github.com/apps/lock
+# Lock prbot: https://probot.github.io/apps/lock/
+# Main code repo: https://github.com/dessant/lock-threads
+
+# Open MPI policy:
+# - Lock issues and pull requests 6 months after they have been closed
+
+############################################################################
+
+# Number of days of inactivity before a closed issue or pull request is locked
+daysUntilLock: 180
+
+# Skip issues and pull requests created before a given timestamp. Timestamp must
+# follow ISO 8601 (`YYYY-MM-DD`). Set to `false` to disable
+skipCreatedBefore: false
+
+# Issues and pull requests with these labels will be ignored. Set to `[]` to disable
+exemptLabels: []
+
+# Label to add before locking, such as `outdated`. Set to `false` to disable
+lockLabel: false
+
+# Comment to post before locking. Set to `false` to disable
+lockComment: >
+  This thread has been automatically locked since there has not been
+  any recent activity after it was closed. Please open a new issue for
+  related bugs.
+
+# Assign `resolved` as the reason for locking. Set to `false` to disable
+setLockReason: true
+
+# Limit to only `issues` or `pulls`
+# only: issues
+
+# Optionally, specify configuration settings just for `issues` or `pulls`
+# issues:
+#   exemptLabels:
+#     - help-wanted
+#   lockLabel: outdated
+
+# pulls:
+#   daysUntilLock: 30
+
+# Repository to extend settings from
+# _extends: repo

.github/stale.yml

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+# Stale bot: https://github.com/apps/stale
+# Stale probot: https://probot.github.io/apps/stale/
+# Main code repo: 
+
+# Open MPI policy:
+# - Warn of pending closure for issues/pull requests if there is no
+#   activity on them for 90 days.
+# - If there's no more activity for 7 more days, close the issue.
+# - Never auto-close issues/pull requests with the label "pinned" or
+#   "security" on them.
+
+############################################################################
+
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 90
+
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - pinned
+  - security
+
+# Label to use when marking an issue as stale
+staleLabel: stale
+
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed in 7 days if no further activity occurs.
+  Thank you for your contributions!
+
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false