Drawing 0.6.1

• new 'save without transparency' action, that works with PNG
• add 'initial color' as a replacement for transparent pixels
• fix a bug in the 'rotate' tool that occured when the selection was flipped before being rotated
• add the additional tool 'points', to help captioning
• update the user help manual
• update several translations

and also:

• normal screenshots with transparent background: if the top-right and bottom-left pixels are slightly visible, appstream-util validate is too dumb to understand it's supposed to reject them