Remaining "cast"/"const" patches

[Matthias Dieter Wallnöfer]

Hi abartlet & list,

here is the last version of my compiler warning patches (casts, consts) 
for s4 and for common code. The s3 only version I dropped since there 
were some concerns about the reasonability (well - there don't exist 
those kind of warnings at the moment so I agree that it wouldn't be 
really needed there).

I propose them here for review as decided with abartlet. Naturally I 
will consider also other requests and concerns. I just want to have this 
work finished soon.

Matthias
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