the existance of a specified header file type.

this is accomplished with smb_lockmsghdr() and unlockmsghdr() maintaining the
new smb_t.locked variable echoing the messagebase header 'locked' state.
Fixed a couple of error cases in smb_addmsghdr() where it would leave the
smb header in a locked state.
Increased the smblib version to 2.16.

hyper allocation method (allocation files aren't used) and closes allocation
file (if opened) on error.

Added support for USENET path and newsgroups header fields.

Added ftn_pid, ftn_area, and ftn_flags header fields/convenience ptrs.

kludge line values.

is NULL (not open) and return SMB_ERR_NOT_OPEN in that case.

Created macros for message base header and message header IDs.

smb_addmsghdr() no longer updates status header if smb_putmsghdr() fails.

(for Unix NFS support).

This will hopefully fix the retry timeout occurring with simultaneous SMB
writes (subsequent threads were starving the initial thread that owned the
lock).

smb_freemsgdat() called with 0 headers will free ALL headers for a given message.