[CNCL wouldn't work with -c] Reload types databases on SIGHUP

[DONE] Non-hardcoded media types and character sets.

[DONE] ``Generated and served by Nokotan'' in directory listings

[DONE] Send multiple directory listing items in a single packet.

[DONE] Do not send strerror messages to clients

[DONE] index.gmi support (?)

geomyidae-like CGI support (?)
