[Docu] Complete documentation.

Documentation/ProjectFile/prj/chemical_system/knobs/i_knobs.md

+an optional tag for numerical setting.

Documentation/ProjectFile/prj/chemical_system/knobs/t_max_iterations.md

+Set maximum number of iteration. This value is commonly set to 100.

Documentation/ProjectFile/prj/chemical_system/knobs/t_relative_convergence_tolerance.md

+Set relative convergence tolerance. In general, this value is set to 1e-12.

Documentation/ProjectFile/prj/chemical_system/knobs/t_scaling.md

+This tag is used for scaling odinary differential equations.

Documentation/ProjectFile/prj/chemical_system/knobs/t_step_size.md

+Set maximum step size. In general, this value is set to 100.

Documentation/ProjectFile/prj/chemical_system/knobs/t_tolerance.md

+Setting tolerance used by optimization solver. This value is commonly set to 1e-15.

Documentation/ProjectFile/prj/chemical_system/surface/i_surface.md

+define surface complexion model.

Documentation/ProjectFile/prj/chemical_system/surface/site/i_site.md

+define properties of surface site.

Documentation/ProjectFile/prj/chemical_system/surface/site/t_mass.md

+specify mass of substance in unit of gram.

Documentation/ProjectFile/prj/chemical_system/surface/site/t_name.md

+specify substance of surface site.

Documentation/ProjectFile/prj/chemical_system/surface/site/t_site_density.md

+specify site density in unit of sites per square nanometer.

Documentation/ProjectFile/prj/chemical_system/surface/site/t_specific_surface_area.md

+specify specific surface area of substance in unit of square meter per gram.

Documentation/ProjectFile/prj/chemical_system/t_use_high_precision.md

+Optional tag. Th default setting is to use high precision. Convergence criterion is thus set to 1e-12. When this tag is explicitly set to false, convergence criterion will be reduced to 1e-8.

Documentation/ProjectFile/prj/chemical_system/user_punch/i_user_punch.md

+contain a number of statements for calculating custom secondary variables.

Documentation/ProjectFile/prj/chemical_system/user_punch/t_headline.md

+specify a number of custom secondary variables.

Documentation/ProjectFile/prj/chemical_system/user_punch/t_statement.md

+state how to calculate custom secondary variables.