Continuing on anchoring and improvements on Nu's overall internal commands (#2635).
`move column` sub command has been turned into the command `move` since
we use it to move exclusively columns. Examples added as well.
Fixed it to carry along any anchor locations that might be in place if
table to be moved originates from other sources.
* make sort-by fail gracefully if mismatched types are compared
* Added a test to check if sorted-by with invalid types exists gracefully
* Linter changes
* removed redundant pattern matching
* Changed the error message
* Added a comma after every argument
* Changed the test to accomodate the new err messages
* Err message for sort-by invalid types now shows the mismatched types
* Lints problems
* Changed unwrap to expect
* Added the -f flag to rm command
Now when you a use rm -f there will be no error message, even if the
file doesnt actually exist
* Lint problems
* Fixed the wrong line
* Removed println
* Spelling mistake
* Fix problems when you mv a file into itself
* Lint mistakes
* Remove unecessary filtering in most cases
