Cryptic error messages

[kynex7510]

I provide 4 paths, which one is it? Kindly implement better error handling.

[wwylele]

TODO list for myself:

• remove generic conversion from io::Error to libsave3ds::Error
• Give DiskFile a builder constructor like std::fs::File
• Record file path in DiskFile, and report it on each potential failure point

Note that the code changes happens mostly in not unit-tested area, so doing #13 would be better

[patataofcourse]

i'm getting this same error too and i'm just really confused since all the paths i'm supplying exist - i've checked
anything i can do to troubleshoot?

[patataofcourse]

nevermind, i added an extra zero to the title ID. you might want to check those before trying to open directories