chancfg.sts`: status 3-chars for 3 statuses

Prepare UI for:
`chancfg.sts`: status 3-chars for 3 status info:
 [0]-  upload status:'r'un/'q'uit
 [1]-download status:'r'un/'q'uit
 [2]-transport queue:'g'o /'s'top

Signed-off-by: Oleg Verych <olecom@gmail.com>
api: small fixes of docs; log `ex.stack` if subapi `eval` failed

Signed-off-by: Oleg Verych <olecom@gmail.com>