Bypass "too far from file corner" error.

[ricardocmj]

It simply sets the default behavior to bypass the following errors:

• "Lower left corner (MINX, MINY) is outside layer bounds BBOX. To remove this condition, set extent_type=loose in your configuration."
• "Current x value MINX is too far from tile corner x TILEX"
• "Current y value MINY is too far from tile corner y TILEY"

This is a workaround for Issue #1