Improved internal _typeof implementation (now it looks on declared types
in some cases instead of trying to guess the type);
Basic support for constants and variables (they can be defined);
Fixed bug which would cause translator to crash if a semicolon was
missing after a function call when the call was the last line of source
file;
Added function _eval() to the translator - the name will probably be
changed;
Removed old and unused Grass  API  description file
Translator prevents constant redefinition, new internal helper method - _whatis() which returns what keyword was used to create given construct (something like meta-type?)
Improved translation of datapieces; variables can be redefined (allows to change value of variables) and redeclared (allows to change both value and type); redeclaration gives the ability to use the variable with various types (kinda like dynamic typing) but preserves the benefits of using strong, static typing
Fixed a bug which allowed for constant redefinition/redeclaration when
using full constant definition syntax (now name-collision kicks in and
prevents this)