renamed ifCRLF to trimCRLF to more accurately reflect the function.

ZString.cpp

@@ -537,7 +537,7 @@ namespace coreutils {
       return *(cursor + index);
    }
 
-   bool ZString::ifCRLF() {
+   bool ZString::trimCRLF() {
       int len = length;
       if (*(data + length - 1)  == '\n')
 	--length;