Replaced most format() calls with concatenated strings (bug hunting).

more storage blocks than originally allocated.

the msg->hdr.length field.

toggle is set.
Extended-ASCII chars in the message Subject are now converted as well.
Extended-ASCII chars can now be converted during import by using the 'a'
(ASCII only) area flag in the newslink.cfg file.

JS_SetProperty, so properties can be marked as READ ONLY.

summary, priority, cost, times_downloaded, and last_downloaded.

expiration dates are always specified in the local timezone.

Created convenience values in smbmsg_t for PRIORITY and COST header field data.
Implemented support for the expiration header field in smb_getmsghdr().
Changed smbmsg_t.expiration from a when_t to a ulong (time_t):
expiration dates are always specified in the local timezone.

Added new optional message header field: SMB_COST (in credits)
Added "SMB_" to the names of (previously unused) header field type macros:
SUMMARY, CARBONCOPY, EXPIRATION, and PRIORITY.
Created convenience pointer in smbmsg_t for SUMMARY header field data.
Created convenience values in smbmsg_t for PRIORITY and COST header field data.
Changed smbmsg_t.expiration from a when_t to a ulong (time_t):
expiration dates are always specified in the local timezone.

removed subcode and message number of originaddr portion,
changed serialno to use only 27 bits of the import time and the low 5 bits of
the message number to generate a more unique serialno.

to download a file, it attempts to CWD to the path, and if the CWD succeeds
the subsequent requested paths are all wrong. This fixes that problem.

>= 4GB is read as 4GB and not -1).

location of the sbbs.ini file.