Only use the delimiter character for trimmed and unscrollable text
Improve warning for obsolete view UI options
Improve documentation of view settings in tigrc(5)

Use more consistent naming convention (view setting vs column option).
Move examples up before the column option documentation to give a better
idea of how the view settings work. Mention 'column option' several
places so users can copy-paste key words from the obsolete option
warning and find the documentation in tigrc(5).