Better clarity, since this option is about writing output to files, not
printing to the console, like eg. `print_progress`.
Also changed corresponding variables in the code.

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>

Also changed the default of `print_progress` to false, since it
generates a lot of clutter in the console output.

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>

Created `agent_writer.hpp` to provide a more streamlined interface
to agent parsing and output. Moved the `to_string` function out of agent
Also changed the agent type of the DeGroot model, so that it contains
the opinion as `agent.data.opinion`.

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>

More fitting name, since it also deals with reading in the agents.

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>

Did not compile on the CI.

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>

The initial convergence check would always return true, since
max_opinion was initialized to 0...

Removed the corresponding functions in `agent_generation` and `io`.
It makes more sense to localize the agent_io in a single header.

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>

We created a new folder called `agents`, analogous to the `models`
directory. This way, agent types can be reused by different models.

Co-authored-by: Moritz Sallermann <moritzsallermann@gmail.com>

We renamed util/io.hpp to network_io.hpp, for consistency with
agent_io.hpp. We also removed the IO namespace.

Co-authored-by: Moritz Sallermann <moritzsallermann@gmail.com>

Co-authored-by: Moritz Sallermann <moritzsallermann@gmail.com>

This is probably generates false warnings, so we disabled it.

Co-authored-by: Moritz Sallermann <moritzsallermann@gmail.com>

Now a lambda function helps set defaults from options.settings, if the
user has not entered values. Now all the defaults are not hard-coded.

Co-authored-by: Moritz Sallermann <moritzsallermann@gmail.com>

Minor bug. Somehow clang didn't catch it.

Co-authored-by: Moritz Sallermann <moritzsallermann@gmail.com>

Io refactor

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>

Used these attributes to get rid of warnings and to improve code
usability.

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>

Fixing typos is very importnt.

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>

This file is no longer needed.

Co-authored-by: Amrita Goswami <amrita16thaug646@gmail.com>