Expand Usability Features

[kings177]

• Add error handling and reporting for IO operations
• Implement utility functions for common tasks:
  • Add IO functions for removing files and directories #418
  • Add IO function for copying files and directories #419
  • Add IO function for creating new directories #420
  • Add IO functions for moving files and directories #421

[enricozb]

Error handling / reporting was done: #407

[nicolas-abril]

Before implementing any other specific file system IO, I think it'd be better to add a shell subprocess call.
That way we have all these functions now, including a lot of stuff not included here.
Not ideal since we don't get nice errors but it fills the need of most users already.

[enricozb]

Yeah I was imagining subprocess could be a solid substitution for these in the meantime