Syntax sugar for Scheme.

Before lactose installation you should install antlr4 for python: pip install antlr4-python2-runtime

To lactose installation you should use make install with optional PREFIX. Example: PREFIX=~/.local make install

To use print_to_pdf functionality graphviz package should be installed. Debian example: sudo apt-get install graphviz

##usefull books R5RS standart: https://www.schemers.org/Documents/Standards/R5RS/r5rs.pdf