Merge pull request #6 from hangum/1.4.1

1.4.1
bug fix #502 - https://github.com/hangum/TadpoleForDBTools/issues/502
Alter Table Dialog.
bug fix https://github.com/hangum/TadpoleForDBTools/issues/524
SQLMap bug fix. remove symbol (;)
Merge pull request #525 from jeongjaehong/1.4.1

bug fix #502 & Alter Table Dialog.