PHRAS-2161_coll-id-in-log-docs_MASTER

- explicit message when databox is failed to mount.
- reconnect db for long migration scripts
- mark (comment) doctrine "binary_strings" type so the upgrade is not done every time because the field was read-back as "varchar"
- proposal on long migration scripts (could be faster)

lib/Alchemy/Phrasea/Controller/Admin/DataboxesController.php

@@ -177,7 +177,8 @@ class DataboxesController extends Controller
         catch (\Exception $exception) {
             return $this->app->redirectPath('admin_databases', [
                 'success' => 0,
-                'error' => 'mount-failed'
+                // 'error' => 'mount-failed'
+                'error' => $exception->getMessage()
             ]);
         }
     }