status updating: a*.c

status updating: a*.c

I went through the places that set context.botl/botlx in src/a*.c to
see whether I could find any unnecessary status updates.  I didn't
find anything interesting, mostly some minor sequencing issues plus
a couple of redundant sets (call foo() which includes setting botl,
then explicitly set botl after it returns).  If you issue pline first
and then set context.botl, bottom lines won't be updated until the
next message or next pass through moveloop.  If you order those the
other way around, status will be updated as the message describing
the reason for the update is being delivered.