Ann: S41.2

[dr.mt...@gmail.com]

This removes a bug - or rather an accidently deactivated feature.  

Shen is suposed to warn you if you redefine a function and change 

its type.  Obviously if you do that your program may not be type secure.

Apparently this feature was not working and perhaps since the S series

began.  A simple one line change put it back and another line was dropped.

Also stlib was revised.  A rather over-engineered vector library notation was

pruned back and the FOR notation simplified and improved.  I'll

document this in due course.

Mark