Tagging the release 2.0.1
/build: Yacas updated to yacas 1.5.0+ dev (git 22f4188).
Tagging the release 2.0.0
/build: Version number set
/build: Update to current src.
/src: enhance help text
/src: set version to 2.0
/build: fix syntax highlighting for notepad-plus and kwrite
/build: update INFO.
/build: Fix issue that D was inadvertently protected after calling Newton.
