Duplicate archives (e.g. ZIP files) often have the different digest/hash/CRC
values because they have a different ZIP comment or the files were archived
in a different order or used different compression schemes. You can now detect
(and delete) these duplicates.

Inspired by Blocktronics (and other ANSI art group) packs' FILE_ID.DIZ/ANS files:
* Support (and prioritize) FILE_ID.ANS
* Convert ANSI color/attribute sequences in DIZ files to Ctrl-A equivalent (uses SAUCE width and ICE color, if specified)
* Don't treat DIZ as a series of lines, they're not always nowadays.
* New putmsg() mode: P_INDENT to print files indented by current column
* Display full (up to 64-char) filenames in lists when using 132+ column terminal.
* Use the Author, Group, and Title fields from the SAUCE if present/non-blank
* 2 new text.dat strings: 301 (FiAuthor) and 302 (FiGroup)
* Also fix bug with repeated Cost header field on bulk-uploaded files.

I know this'll break the *nix build (sauce.c dependency), but I'll fix that next.

Also added -normal option to use save/normal/restore attr sequence for conditional-newlines. This is helpful for narrow ANSIs (e.g. 44-column FILE_ID.ANS) that depend on the viewer to read/use the SAUCE info.

"startup" was being deref'd after the caller free'd it because these thread functions were calling thread_down() before calling mail_close_socket(), which deref's startup which was subject to a race condition.

It Ctrl-A encodes a possibly ANSI-encoded string, supporting on color/attribute sequences and stripping all others.

This caused an issue for the soon to be committed P_INDENT support in putmsg().

Going to use these to store SAUCE "AUTHOR" and "GROUP" fields for files.

To match the Remove file command sequence (for consistency).

This resolves errors when setting these properties to values > 2147483647
example:
!JavaScript  /sbbs/exec/load/sauce_lib.js line 69: Error: can't convert
2430770157 to an integer

That means you can now seek around (set position) within files > 2GB, truncate
or extend a file > 2GB, or set a file's date to > Jan-19-2038.

Increase total extended description length from 1024 to 4000 characters. Perhaps this should be configurable?

moved postit.js to its rightful home in the xtrn folder. anyone using this script likely already has it there anyway. if not, data files should be moved for anyone updating their local script. no file changes have been made.

Log an info-level message instead.
Raise the log level severity of duplicate votes from Debug to Info too.

Extracting a file_id.diz would fail if the file contained any disallowed filenames before the DIZ, e.g.:
 Error: disallowed filename '_blockmen_res[v]olution.ans' (after extracting 0 items successfully)

This variable tracks the time that jsdoor was started.

There was a bug with reloading the configuration files in sbbsctrl where the sound button no longer reflected the truth and the sysop's previous click-state of the button was lost. Rather than going through writing the OPT_MUTE flag to the Options fields of all the sections of the sbbs.ini and then re-loading that file as a result, just do like we did with the sysop chat availability: use a semfile. So much simpler.

If anyone ever needs instance-specific muting, we can create/check instance/host-specific mute semfiles then. Doubt that'll happen though.

Also, removed the old sysavail control methods of ntsvcs too.