Make backspace work on typeahead, treat del and backspace as equivalent

14 jobs for mlong/tahead in 10 minutes and 36 seconds (queued for 12 seconds)
Status Job ID Name Coverage
  Build
passed #10501
FreeBSD
jsdoor-freebsd

00:05:57

passed #10502
Linux
jsdoor-linux

00:07:53

passed #10504
FreeBSD
jsdoor-windows

00:03:55

passed #10496
FreeBSD
sbbs-freebsd

00:07:10

passed #10491
Linux
sbbs-linux

00:08:42

passed #10494
Windows
sbbs-windows

00:05:34

passed #10503
FreeBSD
sexpots-freebsd

00:00:38

passed #10492
Linux
sexpots-linux

00:00:16

passed #10495
Windows
sexpots-windows

00:00:34

passed #10499
FreeBSD
syncdraw-freebsd

00:00:58

passed #10500
Linux
syncdraw-linux

00:01:54

passed #10497
FreeBSD
syncterm-freebsd

00:01:52

passed #10493
Linux
syncterm-linux

00:02:10

passed #10498
FreeBSD
syncterm-windows

00:02:59