[Developers] Patch: Check string lists for overflow

[Erik Schnetter]

String lists have a maximum size that is decided when it is created.  
When adding strings to a list, check that this size is not exceeded.

-erik

PS: It should be documented that string lists are really string sets.  
Duplicate items, as decided by case-independent comparison, will not be 
added.

-- 
Erik Schnetter <schnetter at aei.mpg.de>   http://www.aei.mpg.de/~eschnett/

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