Added database importer importdb.bat

Process now as follows:
1) Complete some work, manipulate some data.
2) Run exportdb.bat to export the latest database.
3) git add .
4) git commit -am "Message"
5) git pull origin master (then merge databases)
5.1) if manual merge, commit marge
6) git push origin master
7) Run importdb.bat to import latest database from all users.