CHANGES:

v0.0.3
------
*) Fix a memory leak.

v0.0.2
------
*) Bring in ENERGY formulas:
      - Gravitational Potential Energy,
      - Kinetic Energy (energy of motion),
      - Potential energy of compressed strings.
*) Implement invoking of the bc(1) calculator.
*) Finish electricity formulas. 

v0.0.1
------
*) The first release of the program.
*) The following 'topics' are in:
    - Circular motion
    - Projectile motion, as well as all the kinds of horizontal non-curve
    motion - accelerating, uniform, etc.
    - Gravity
    - Electricity and Magnetism