File mtt/lib/comp/compound/Thermal/RT/RT_desc.tex artifact 2c0ca51cf3 part of check-in 90a0ffa88f

Component \textbf{RT} is a two port thermal resistor with true power
bonds. Internally, it has a pseudo Bond Graph representation, and the
corresponding thermal resistance just acts as an ordinary one-port
\textbf{R} component.