* Added `edit` which uses the program in $EDITOR to allow the user to edit the
current timeline marker.
* Added `delete` to remove the current timeline marker from the timeline.
* Added support for using a named TTY device in order to use an interactive
program ($EDITOR in this case) to take over interaction with the user. There
is still a problem with this, in that a process by default only has access to
its controlling TTY device. This mean, for example, that redirecting the
subprocess input and output to the TTY will fail to work properly if the
timestamper CLI process is not part of the same process group as the process
owning the TTY the user is interacting with. This is the case when using
nailgun: the java process running TimeStamperCLI is not part of the same
process group as the user's client shell.
I think TTY device permissions may be alterable, and we can work around this
by changing the permissions for the current TTY in the launcher script that
invokes the nailgun client. Needs more investigation.
* Added package build target to create a zip of the CLI standalone installation.
