fix clear-cache-watcher if server.domain is not set in config.ini

Fall back to cache/lastdomain in that case.

makes clear-cache-watcher work together with kwf-app-demo installation instructions where server.domain is usually not set
grid column displaying scaled preview image of an upload
extend image column

- add setMaxHeight
- add setShowHoverImage
image column: support dynamic width
clean up trl.xml
Merge branch '3.0' into 3.1

Conflicts:
	trl.xml
Merge branch '3.1' into 3.2

Conflicts:
	trl.xml
set 'no entries found' as default text in view
Merge branch '3.2'
image helper: support specifying fixed width/height

this allows usage of retina (only) images
add helper 'includeTemplate' (like partial-helper in zend)
fix component link redirect in mail
mail image-replacement now supports background-tag
fix image helper typo and change back order of attributes

many test rely on this order
fix test
Merge branch '3.2'
workaround broken type=number in browsers
only format decimals when allowDecimals is true
onElementReady: ignore errors when decoding config options
change priority for initializing form components