[TYPO3-templavoila] Thumb generation of DS and TO previewIcon

[Steffen Kamper]

Hi,

following feature was committed:

When using previewIcons for DS or TO they are not resized but displayed 
in orignal size.
This enforce to create the icons in the prefered size.

Now you have the possibility to set these preview icons to thumbs 
(pageTS or userTS)

mod.web_txtemplavoilaM2 {
     dsPreviewIconThumb = 120x80
     toPreviewIconThumb = 120x80
}
will resize the previewIcons to prefered size ([width]x[height])

mod.web_txtemplavoilaM2 {
     dsPreviewIconThumb = 1
     toPreviewIconThumb = 1
}
will resize the previewIcons to standard BE thumb size (which is 56x56)

without the setting previewIcons will displayed in original size (same 
behaviour as before) which is the default.

This is added to manual also.

vg Steffen