Changes in version 2.0.0-2                       

    o   Elemental formulas (O2 and H2O) are no longer subscripted in
	cplab.

    o   Update terminology: stoichiometric oxygen and water content
	instead of oxidation and hydration state.

                 Changes in version 2.0.0 (2024-03-28)                  

    o   The package has been revised to focus on chemical analysis of
	proteins. Functions have been added for reading FASTA files and
	calculating more chemical metrics. Data, functions, and
	vignettes for differential expression analysis have been moved
	to JMDplots. Amino acid compositions of human proteins are
	still packaged with canprot.

    o   Add vignettes _Demos for canprot_ and _More about metrics_.

    o   Add demos thermophiles.R, locations.R, and redoxins.R.

    o   Add add_cld() (adds compact letter display to boxplots), used
	in demo/locations.R.

    o   read_fasta(), count_aa(), and sum_aa() have been renamed and
	moved from CHNOSZ to canprot.

    o   calc_metrics() and add_hull() have been moved from chem16S to
	canprot and are used in demo/thermophiles.R.

    o   Add functions for metrics: plength() (protein length), V0() and
	S0() (standard molal volume and entropy per residue), pV0() and
	pS0() (volume and entropy per protein), V0g() and S0g()
	(specific volume and entropy), Zcg() (specific carbon oxidation
	state), nO2g() and nH2Og() (specific stoichiometric oxidation
	and hydration state), Density() (mass density), SV() (entropy
	density), HC(), NC(), OC(), and SC() (elemental ratios), nC()
	and pnC() (C atoms per residue and per protein), Cost()
	(metabolic cost of amino acids from Akashi and Gojobori, 2002),
	RespiratoryCost() and FermentativeCost() (respiratory and
	fermentative costs from Wagner, 2005), and B20Cost(),
	Y20Cost(), and H11Cost() (biosynthetic costs from Zhang et al.,
	2018).

    o   Rename ZCAA(), O2AA(), H2OAA(), and MWAA() to Zc(), nO2(),
	nH2O(), and MW().

    o   Add terminal_H2O argument to nH2O(), used to specify how
	terminal -H and -OH groups are counted (they are not by
	default).

    o   Add ... argument to functions to permit using the same
	arguments for all metrics in get() or do.call() constructions.

    o   Objects in cplab are now quote()-ed instead of expression()s
	for easier downstream handling.

    o   protcomp() has been renamed human_aa().