Another vi update from Sterling Huxley:

- All of the ESC sequences are now in variables.  This should make
  re-targeting for other terminals easier.

- The initial screen draw does not force out every single column.
  Should be faster.

- The place_cursor() routine trys to be smarter about moving the
  cursor.  This is optional based on BB_FEATURE_VI_OPTIMIZE_CURSOR.

- The 't' and 'f' intra-line positioning commands were added.
  They can now be used as targets in 'c' and 'd' commands, i.e.,
   dfx - delete from dot to next 'x'
   dtx - delete from dot to the char before next 'x'

- show_status_line() uses a static int checksum to remember what
  is currently displayed on the screen and not re-draw the status
  line unless it has changed.

- Some of the code in refresh() was moved out to format_line().
  refresh() trys to send out the smallest segment containing
  the changed chars rather than the whole line.

- Added "flash" to the :set command to specify if error indication
  should be by flashing the screen or ringing the bell.

- Changed the rawmode() routine so that it turns off the
  NL -> CR NL translation. On output of a NL, the OS will not add
  a CR.

- If vi was started as "view", with global read-only mode,
  and another file is opened, the file is opened read-only
  rather than read+write.

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