Changed build dependency for debian to libginac11, dropping support for Ubuntu 20.04LTS
Fix formatting error in output of maps of GiNaC::ex
Silence compiler warning
Fix bug that forgot to pop matched brackets in the parser
Fix bug that printed wrong include file name when an error occurred
Remaining stuff
Refactor parser rules for UNITDEF and PREFIXDEF
Create separate parser rules for type checking of various non-terminals