Add a call to check for orphaned versions after any checkout (#1973)

* Add a call to check for orphaned versions after any checkout

* use == instead of -eq for optional

* Add a scripts/install-repo-checks for things to run after checkout; only this versioning error checked for now

scripts/post-checkout.sh

@@ -0,0 +1,3 @@
+#/bin/sh
+
+find . -name "*.~[1-9]*~" -exec if \[ ! -f {}:h \]\; then echo "{}" " with no versionless" \;