#4 ASCII import improvements

[Herisson]

I would like to import "home made" ASCII files, with
other extensions than *.dat. Actually, the ASCII import
works only with .dat files, and I personnally have so
many ASCII datas files that one unique extension is not
enough !

And maybe this ASCII import should provide a larger
compatibility with the different kind of EOL: line
feed, line feed+ carriage return, carriage return...

But anyway, it's already great !

Didier