v1.0.1 stable

What's in version 1.0.1:

• use newest flipjump version.
• add bf2fj --cells option (can modify the number of brainfuck cells to be reserved in the output flipjump file).
• add pytest --compile-only option.
• keep documentation updated.

It is all tested, and ready to be used on windows and linux (and mac shouldn't be a problem), with python 3.8+.