v. 0.6.100 Historical only. Last version to use original interpreter

This release is strictly for historical purposes. It's the last version that includes the original interpreter, which has been replaced with a faster, simpler interpreter. Because of the changes in the interpreter (catalogued under JACOBIN-592 in YouTrack), a number of gfunctions (Java library methods rewritten in go) had to be modified. The original gfunctions are included in this release.