BUG Fixing creationtask to be compatible with SS 3.1
BUG Prevent error when saving a file where resampled image is deleted.
NEW adding the ability to disable the "Replace" tab.

Use the SS3 config system. Useful when using replaceFiles = true in the
CMS to prevent functionality clash.
Merge pull request #24 from mateusz/julians-fixes-1

Julians fixes 1