More equations.
Added some vector arithmetic and statistical mechanics stuff.
Added commonly used unicode math symbols to save time.
Added more to the unicode symbols.
Fraction handling.
Lenz's Law.
Some simple tensors.
Renamed equation search so it is easier to use in a PATH.
Made python script executable.
Made shebang more portable.
Added some optics equations.
Fixed the path so that it can access the database even if run from a symlink to the script.
Made file input and output strategy more explicit.