Initial release of the arbitrary-precision unit-aware calculator fend.
This release includes the following features:
- Arbitrary-precision arithmetic using rational numbers
- Support for complex numbers
- Binary, octal, hexadecimal and other number bases between 2 and 36
- Keeps track of units, with support for SI and US customary units
- Support for Emacs-style CLI shortcuts
- Trigonometric functions
- Useful physical and mathematical constants