single function.
* editfile() now modifies a temporary copy of the file which solves 2 problems:
A. editors restricted to the temp dir (e.g. PICO) can now be used to edit other
    files (e.g. sig files)
B. DOS editors can now be used to edit files with long filenames
    (e.g. .plan files)

no need to do manual initialization here.

the include directory to get the new include/mozilla/nspr header files
(or js_internal.c will fail to compile)!
savemsg() now uses smb_addmsg() for most of it's functionality.
savemsg() now accepts an optional client_t* argument, if non-NULL will
automatically call msg_client_hfields().
MsgBase.save_msg() method now accepts an optional client object argument to
automatically set the security log header fields (sender IP addres, hostname,
protocol, and port).

types for forwarding netmail.
Using new smb macro: smb_hfield_bin() for storing recipient net type.

so configured in SCFG->System->New User Values->Question Toggles.

and net_addr() to smb_netaddr().

call smb_freemsgdat/dfields *after* logging smb.last_error.

for additional tracking information.
Created DLL-exported msg_client_hfields() in postmsg.cpp as a common function
to add these client tracking header fields.

used to trace message origins for security reasons.

smb_hfield_append_str() used for creating and appending ASCIIZ header fields.
These functions handle the string-length calculation automatically.

new smblib functions, and supports auto-forwarding to netmail addresses.

outside the sbbs_t class).

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