Fails to write survivor for source files in subdirectories

[nomeata]

Autobahn just finished, but it does not write the suriving code out. Most likely because the filename is src/Foo.hs, and while Autobahn creates the autobahn-survivor directory, it does not create autobahn-survivor/src before writing Foo.hs there.

[dnunez02]

Commit a7a22a4 addresses this by prepending the path to the project to all filenames given to Autobahn for editing.