CODE: Massive change of watermark gui constructors.
Added: gui rotation and position offset
FIX #27 Add watermark offset and rotation
FIX: Text color ignored if loaded from presets
FIX: Delete preset file list before adding sets from the combobox
FIX: xcf psd and ai load inmediatly. header info to get size data

Instead of call "identify" to get size and width we now read the
file header to read the byte data. No more waiting with big files
FIX: Do not use a tmp file to generate and display Thumbnails
Created lib directory and moved tkdnd to lib/tkdnd
FIX: Do not depend on md5 to calculate thumbnail location

This thumbnail behaviour needs to be fixed for windows
FIX #34 : Added watermark wrap mode for easy image array creations
FIX: regression. No widget for preview size
Enhance presets.config parsing
FIX Missing Keep format option

This is the last v1 missing from v2.
FIX #46 : Added new icon set