This was causing unnecessary trouble with loading inputs when running
the command line.

Fun unpack_app_state changes gui$paths$data to absolute path now (otherwise dfile_list is not immediately filled).

* state(pack_project): New function.

* tests: New tests.

Also, adapt code affected by this elsewhere.

* shiny-state.R (which_gui_inputs, which_metfrag_inputs,
unpack_app_state, unpack_app_state_metfrag, input2conf_metfrag,
input2conf, app_state2state): Updated. The inputs are defined
in a more structured manner and this resulted in having to update
the entire system of state creation fom GUI.

* shiny-ui-base.R : Updated. Temporary reorganisation while the
app.Rmd is being rebuilt.

* state.R(metfrag_param): New function. Creates MF parameter object.
(metfrag4conf): New function. Creates a conf entry.
(metfrag_conf): Updated.

* inst/rmd/app.Rmd: Under reconstruction.

* app_config_and_status: Updated. Replaced metfrag controls with inject_inputs.