* Parses/consumes QWK headers.dat files
  - No more to/from/subj length limits
  - Extensive header details transferred for each message
  - IP/hostname filters (.can files) are applied to appropriate header fields
  - Code cleanup in the QWK functions
* New functions to read/parse/search filter (.can) files as string lists
  - Performance boost - no need to open/read/close .can file for each message
* More thread-safe Message-ID retrieval/generation (ftn_msgid and get_msgid)
* Better Message-ID generation for misconfigured systems (e.g. no hostname)
! These changes require the latest smblib and xpdev libraries !

set.
Use ctime() for displaying times in message headers (second-granularity).
More use of SAFEPRINTF.

set.

and is now re-displayed if the download fails/aborted and the user downloads
the packet again.

Fixed checking of logons per day limit and L-restriction (off-by-one).

the flag is already set.

startup option - we will *always* use the local timezone. If the sysop wants to
use GMT/UTC, they should configure their operating system accordingly.

A lot of strcpy->SAFECOPY and sprintf->safe_snprintf/SAFEPRINTF conversions
and other general code cleanup too.

Numerous bounds-checking additions.

server.

at the start of the function rather than at the end.

Also, for sbbs_t.getsmsg() clear the node.misc bits for all nodes with
the to user rather than just the current node.

This allows using a private DNS server when an external interface is specified
(ie: DNS Server of 127.0.0.1 with an interface address specified)

If default value is not zero, it is the value returned if enter is
pressed with no input.  In this case, zero is allowed to be entered.

(internal code).

alias.

Update JSDOCS descriptions of user props.