Allows for more/better wildcard matching in viewable and testable
file types and download-events (e.g. "tar.gz" or "tar.*").

This solves the "double-dot" problem in some file types/extensions.
An implicit "*." is prepended before the configured file type/extension.

Sometimes files uploaded may have the wrong case in the filebase (a different
unresolved issue), but for instances where that has happened, make those files
viewable in sbbs. This really only impacts target OSes with case-sensitive
file systems (e.g. *nix).

Now archive.js can be installed as a sort of "fall-through" file viewer (rather than listing all the supported/possible archive extensions as separately viewable file-types):
File Extension        *                
Command Line          ?archive list %f 

Now, just 'E', then 'D' from the batch flag prompt has you editing a file description - rather than going through all the prompts for uploader name/date, etc.

Added text.dat string FileInfoEditPrompt.

Does not allow rename of file from this prompt - perhaps it should?

Resolves issue #263.

This won't impact Synchronet as it has a separate signal handling
thread, but we still need to behave properly for processes that
don't.  I'm also saying that ENOMEM does not indicate a disconnection,
though it may be better to pretend it was disconnected...

Most of the copyright years in the source code were misleading (the date of
most recent publish was actually later) and all were unnecessary. I've been
removing copyright years piecemeal, for a long time, but I decided it was time
to just perform a bulk search and (mostly) replace. In some cases, I left
old copyright years on files that either are not used (and soon to be removed)
or obsolete and unlikely to ever be touched again (e.g. Win9x FOSSIL VXD). Some
of the runtime binaries still contain copyright years and those were updated to
2018.

- FILE_AREA
- FILE_AREA_DESC
- FILE_LIB
- FILE_LIB_DESC
- FILE_LIB_NUM
- FILE_DIR
- FILE_DIR_DESC
- FILE_DIR_CODE
- FILE_DIR_NUM
- FILE_NAME
- FILE_DESC
- FILE_UPLOADER
- FILE_SIZE
- FILE_CREDITS
- FILE_TIME
- FILE_TIME_ULED
- FILE_TIME_DLED
- FILE_DATE
- FILE_DATE_ULED
- FILE_DAT_DLED
- FILE_TIMES_DLED
Fixed MSG_ATTR @-code (missing SPAM attribute)
New text.dat line: FileHdrDescSeparator, displayed between file detail display
(name, date, uploader, etc.) and extended description, if there is one. This
is used to execute showfileavatar.js.
New JS 'bbs' object properties:
- file_name
- file_description
- file_dir_number
- file_attr
- file_date
- file_credits
- file_uploader
- file_update_date
- file_download_date
- file_download_count
Inspiried by Lon Seidman's now infamous (but likely common) Synchronet sysop
blunder (removing a file rather than downloading it while demonstrating his BBS
on his youtube channel:
- New text.dat line: RemoveFileQ <- using this rather than the vague:
  AreYouSureQ, when prompting to remove a file
- The sysop command to remove files from the batch file flagging prompt has
  been changed from 'D' (delete) to 'R' (remove).
- The 'D' command from the batch file flagging prompt may now be used for
  immediate Download of any flagged file(s).
- When flagging files with '*', treat the same as '*.*'

EX_STDOUT, defining EX_STDIO (to be both STDIN and STDOUT), adding XTRN_CONIO
and EX_CONIO (for future cioxtrn/doorway mode on Windows), change IO_INTS to
XTRN_STDIO

Added HOST and IP keywords to allow restricted access/privileges to/for
specific remote hostnames or IP addresses (wildcards allowed).
All string-argument type ARS keywords (e.g. SHELL, PROT, etc.) now support .can
style wildcards.
The current remote client is now used for protocol, host, and IP ARS checking,
when available, so this requires passing the client pointer around (which
explains why so many files are touched by this change) and takes care of a
long standing to-do item (the user's 'modem' value was used for the PROT
value checking, which was not always correct).

changed FileNotThere text.dat entry to FileDoesNotExist which displays the file
path.
Now check if the directory exists before checking the available disk space
before allowing file uploads and report the correct error (using
DirectoryDoesNotExist) if the directory is missing (a common mistake).
Overhaul viewfilecontents() - wow, I can't wait to re-write all of this moldy
filebase code!

insensitive.

Changed EX_CC to EX_SH.

Each function that requires a temp string variable, now has its own "tmp" local variable.