redundant flag name check

[ffaf1]

flag -invalid

is already checked by the parser

[ffaf1]

Same for non ascii chars

[ffaf1]

@andreasabel a quick update in your email (tl;dr: my machine died, but that is not much of a big problem)

[ffaf1]

@andreasabel a GSoC request in your email

[ffaf1]

@andreasabel , did my email arrive? Do you need more infos?