Enable lock-related debugging

src/imapdomo.skel

     #
     # Put the lockfile
     #
+    debug -v NoLock
     $NoLock && return 0
     date +"$$@%s" > "$IMAPDOMO_USER_CACHE/lock"
+    debug -f "$IMAPDOMO_USER_CACHE/lock"
 }
 
 is_locked() {
     # True if lockfile exists. False if lockfile does not exist or locking
     # is turned off.
     #
+    debug -v NoLock
     $NoLock && return 1
+    debug -f "$IMAPDOMO_USER_CACHE/lock"
     test -e "$IMAPDOMO_USER_CACHE/lock"
 }
 
     #
     # Remove the lockfile
     #
+    debug -v NoLock
     $NoLock && return 0
+    debug -f "$IMAPDOMO_USER_CACHE/lock"
     rm "$IMAPDOMO_USER_CACHE/lock"
 }