Nice new features.

Today, committed/ pushed several new features into git repo on SF.
Some of them:

• Supporting every-day operators in PR language now.
• Supporting methods, classes and constructors in PR now.
• Added a new kind of operator: The stringizing op for single operands and for executing whole code blocks within an expression.
• Cleaned up the variable scope handling. Have a "local", "object" and "global" scope now.
• Several bug-fixes.
• Added some first examples pr scripts to the repo.