Add merge_using_dump.sh

merge_using_dump.sh

+#!/bin/bash
+rm -f dump.sql output_with_dump.db
+for f in "$@"; do
+    sqlite3 -vfs unix-none $f ".dump" | sed -e "s/CREATE TABLE/CREATE TABLE IF NOT EXISTS/" | sed -e "s/CREATE INDEX/CREATE INDEX IF NOT EXISTS/" >> dump.sql
+done
+sqlite3 -vfs unix-none output_with_dump.db ".read dump.sql"
+rm -f dump.sql