Removed line breaks from `dot` export and fixed naming error
* "doubleToString" converts a string to double, i.e. it should be named "stringToDouble"…
Added argument and tree export mode to frontend
* arguments are managed through boost::program_options
* default continues to be the REPL
* "--tree" argument switches from calculation to tree export
* "--input" may be used to pass terms to be evaluated via CLI arguments
** disables REPL