Create required folders for autoreconf and improve error message

Signed-off-by: Stefan Beller <stefanbeller@googlemail.com>
Add more things to .gitignore

Signed-off-by: Stefan Beller <stefanbeller@googlemail.com>
gitignore files created by configure

Signed-off-by: Stefan Beller <stefanbeller@googlemail.com>
Merge pull request #9 from stefanbeller/master

Various things regarding building graprof