Variables now have a summary and a long description.
Only the summary is shown with help.
The long description is shown with "show variable foo".
Fix the scrolling bug where we would sometimes fail to scroll
the screen down, leaving the current message off
the bottom of the screen.
Added a 'scrollmode' variable which determines how the screen
will scroll as the cursor moves. The default behaves
identically to previous versions of owl.
The following modes are supported:
normal - This is the owl default. Scrolling happens
when it needs to, and an attempt is made to
keep the current message roughly near
the middle of the screen. (default)
top - The current message will always be the
the top message displayed.
neartop - The current message will be one down
from the top message displayed,
where possible.
center - An attempt is made to keep the current
message near the center of the screen.
paged - The top message displayed only changes
when user moves the cursor to the top
or bottom of the screen. When it moves,
the screen will be paged up or down and
the cursor will be near the top or
the bottom.
pagedcenter - The top message displayed only changes
when user moves the cursor to the top
or bottom of the screen. When it moves,
the screen will be paged up or down and
the cursor will be near the center.
