SMB_MAX_MSGS, SMB_MAX_CRCS, SMB_MAX_AGE, and SMB_TOTAL_MSGS.

Added curmsg and msgs elements to smb_t definition (for new @-codes).

bcc/linux sopen/lock to succeed.

Now changes current directory to ctrl_dir, allowing relative paths to be
created successfully by write_xxx_cfg() functions.

mail_t and post_t are now defined as SMBLIB's idxrec_t.
This fixes the problem of msgtoqwk() not having access to the correct idx data.

mail_t and post_t are now defined as SMBLIB's idxrec_t.

Changed qwkmail_time to ulong (to match idxrec_t.time).

Added Blacklisted Mail radio buttons: Flag, Ignore, and Refuse.
Added Blacklisted Mail Flag edit box.

Spam log entries now reflect the action taken (not always "REFUSED").

(functionality now provided by dns_blacklists.cfg)

The hardcoded RBL functionality has been replaced with dns_blacklist.cfg.
Created option bits: MAIL_OPT_DNSBL_IGNORE and REFUSE.
If neither is set, mail is marked with optional subject flag and X-RBL header.

Fixed subject, to, and from CRCs in message base index (lowercase conversion).
Fixed memory leak if message base constructor failed.
Added support for USENET Path and Newsgroups header fields.
Added optional parameter to get_msg_header to force regeneration of msg-ID.
 - this solves the dupe-loop problem in newslink.js with messages imported with
 - QWKnet MSGIDs.