BndPreferencePage: use at most (not at least) 4 columns

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
ProjectLayoutGroup: use at most (not at least) 4 columns

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
release: improve the size of the workspace release dialog

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>