[ETP] support SITE command for FTP

[evert_mouw]

The SITE command is normally used for custom, site-specific FTP commands. See e.g. section 2.4 of rfc5797

The ETP extension uses the EVERYTHING command, without the SITE base command.

That is unfortunate, because some FTP servers, such as glFTPd, allow users to specify custom SITE commands in the config file and implement them in any way they like.

So, if FEAT doesn't show up EVERYTHING, could a Everything client just try SITE EVERYTHING instead? It would be more RFC compliant and help making the extension more popular.

Basically, I'm asking for SITE EVERYTHING as a fallback.

[void]

Added to my TODO list: add EVERYTHING to the SITE command and add EVERYTHING syntax to HELP command.

Thanks for the suggestion.

[evert_mouw]

Thanks a lot