Improve auto indent

[Wolfgang]

As discussed here, the new and nice auto indent feature does not always work consistently. I suggest to improve this:

• at present auto indent considers the first 40 characters of a line only; if indentation is later, say at column 44, auto indent fails. I suggest to loosen this restriction and consider up to 100 characters
• at present, different comment styles are treated differently. Although /* */ is THE valid C comment, auto indent can be configured only for the // style comment, it ignores this setting for /* */ comments. I suggest to treat both types of comments the same way

Thanks!