some more info on the ctype extension

diff --git a/ext/ctype/CREDITS b/ext/ctype/CREDITS
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+ctype
+Hartmut Holzgraefe

diff --git a/ext/ctype/EXPERIMENTAL b/ext/ctype/EXPERIMENTAL
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+++ b/ext/ctype/EXPERIMENTAL
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+this extension is experimental,
+its functions may change their names 
+or move to extension all together 
+so do not rely to much on them 
+you have been warned!

diff --git a/ext/ctype/README b/ext/ctype/README
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+this is an experimental extension that provides the
+ctype family of function available in C
+i'm not sure about whether they should go into ext/standard
+or stay as an extension of their own and about using 
+a ctype_ prefix or sticking with the C names ...