Add submission file root path option to the specs and config

src/default-cavecomm.conf

@@ -8,6 +8,7 @@
 # emailPassword=
 # emailServerAddress=
 # domain=
+# submissionFileRootPath=
 
 # Optional if CROW_ENABLE_SSL not defined
 # sslCrtPath=
@@ -51,6 +52,7 @@ itemsPerPage=5;
 bruteForceMitigationLockSeconds=900;
 bruteForceMitigationAttempts=5;
 
+submissionFileRootPath=./submissions;
 submissionMaxFileSizeMB=8;
 submissionMaxtotalStorageMB=16;
 submissionMaxStorageDurationH=24;