Improvement: Add a flag to transmit without further question

[agbcix]

I understand that using --transmit has some security implications. Thus there is a prompt to ensure that the user needs to make an informed decision.

I see a use case for some kind of batch mode. I.e. someone who doesn't want to be prompted for approval.

I can imagine to have some --force-transmit or --transmit -y flag.

Using echo "yes" | augsburg-traceroute --transmit will do the same -- which may be considered as argument pro and contra at the same time.

[vhein99]

I like the idea of implementing a switch for proceeding without further input,
it certainly makes the program a better fit for use in automated scripts.

I personally like the idea of a generic -y switch,
should more prompts be added to the client in the future (which is unlikely, but still possible)
we can handle them all with the single switch, instead of implementing a specific force flag like --force-transmit
for each of those prompts.

[vhein99]

Requested improvement implemented by commit ea828f6.
The user can now specify the -y / --assume-yes switch to run the program in batch mode.