Shell tools refurbished for the JSON era

The script jtool acts as a front-end for the rest of tools.

Prototypes implemented

jtool-journal
jtool-ls
jtool-lshw
jtool-pager
jtool-ps
jtool-stat

Make pager builtin???

Other candidates to implement

lsmod
find
netstat
getent passwd
getent group
getent group
getent ...
...