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1. Field of the Invention The present invention relates generally to incorporation of thermal energy storage materials into porous materials. More particularly, this invention relates to incorporation of solid phase-change materials into porous materials such as gypsum wallboard and cellulosic materials such as ceiling tiles and wood. Even more particularly, this invention relates to improved methods and techniques for incorporating phase-change materials and other chemicals into porous construction materials. 2. Description of the Prior Art Energy is commonly stored in heated bricks, rock beds, concrete, water tanks, and the like. Such thermal energy storage methods require leakproof containers and/or extensive space and mechanical support for the massive amounts of storage materials. In such materials, the amount of energy stored is proportional to the temperature rise and to the mass of the storage material, and is generally limited to about 1 calorie per gram per degree Celsius (1 BTU per pound per degree Fahrenheit). In contrast, phase-change materials store much larger amounts of thermal energy over a small temperature change by virtue of reversible physical/chemical/structural changes such as melting. For example, certain hydrated inorganic salts used for thermal energy storage absorb as much as 96 BTU per pound at the melting temperature. There are disadvantages to the use of solid/liquid phase-change materials. They must be reliably maintained in a durable container and their melting-crystallization change must be fully reversible. In the past, many solid/liquid phase-change materials have leaked and/or have lost storage capacity because of irreversible changes over periods of time. In addition, the conduction of heat into and out of solid/liquid phase-change materials is commonly limited by the poor thermal properties of the liquid phase of the material and/or its interface with the container used to hold the phase-change material. A series of organic polyols which are related compounds with tetrahedral molecular structures has been known to be suitable for thermal energy storage. These polyols include pentaerythritol (C.sub.5 H.sub.12 O.sub.4), pentaglycerine (C.sub.5 H.sub.12 O.sub.3), neopentyl glycol (C.sub.5 H.sub.12 O.sub.2), neopentyl alcohol (C.sub.5 H.sub.12 O) and neopentane (C.sub.5 H.sub.12). Certain of these polyols can be alloyed together to provide reversible solid-solid mesocrystalline phase transformations of high enthalpy and adjustable temperatures of transition. These polyols are referred to as phase-change materials (PCMs), which reversibly absorb large amounts of thermal energy during solid-state transformations at temperatures well below their melting temperatures. These transformation temperatures may be adjusted over a wide range by selecting various compositions of solid-solution mixtures of the polyols. A large number of phase-change materials were evaluated by NASA in the 1960's as "thermal capacitors" to passively buffer the temperature swings experienced by earth orbiting satellites. See Hale et al., Phase Change Materials Handbook, NASA Report B72-10464 (Aug. 1972). Among the hundreds of phase-change materials evaluated by NASA were a few materials which exhibited solid-to-solid transformations with large enthalpies. Though these materials were not used for space applications, a decade later they became of interest to scientists searching for better phase-change materials for thermal energy storage. Solid-state phase-change materials have the