Add a new total line in the displayed results.

This line is only displayed if more than one line has been displayed.
Manage the sort and reverse-sort options.

If one of those options is selected, the result will be appended in a buffer instead of the standard output, and then we will sort the buffer and display it.
In order to avoid sorting human readable sizes, the kilobytes size is always appended as prefix of the line, and after the sort, we remove it, using the cut command.
Remove b and bytes options.

They are no more taking care of, since 6dd7395, but the arguments parser is still parsing them.
Correct human-readable option, was human_readable :/
Correct the mutliple types, was working with only 2 types.

The split by : character, was splitting the string only in two parts, even if they were more than 2 types specified.
Correct bug when a type is specified and no file is found for this type.
Release v0.3