CR: make extended syntax bindings available by default

[felix winkelmann]

Currently only the standard R5RS syntax bindings are available in code evaluated at runtime. To add the non-standard syntax definitions that csi provides, one has to evaluate (require-library chicken-syntax) or (declare (uses chicken-syntax)). This is not overly obvious, particularly for new users.

The suggestion was made to load these syntax definitions by default, which will also remove one difference between compiled code and code running in the interpreter.

Compiled applications can still avoid the extra load-, initialization- and runtime memory-overhead by using the -explicit-use compiler option.

[felix winkelmann]

Poll(Make extended syntax available by default?; Yes; No)

[johnwcowan]

Replying to felix:

Poll(Make extended syntax available by default?; Yes; No)

[felix winkelmann]

Accepted.