(optionally) tag dprint lines w/ device and core id and risc id

[pgkeller]

dprint lines should be prefaced w/

device:(x,y):n

where:
device is the device id
(x,y) is the core
n is the riscv id (brisc=0,ncrisc=1,trisc*=2,3,4)

Also: update watcher to use consistent naming, eg, for the log file (note: it won't have the riscv id)