flock instead of locking files, major security fixes, minor other stuff

long headers can cause sendmail to loop; bug report 4.3BSD/usr.lib/126
getc() calls in collect() will never time out; bug report 4.3BSD/usr.lib/127
mail bounces on transient errors; bug report 4.3BSD

long headers can cause sendmail to loop; bug report 4.3BSD/usr.lib/126
getc() calls in collect() will never time out; bug report 4.3BSD/usr.lib/127
mail bounces on transient errors; bug report 4.3BSD/usr.lib/135
sendmail security problems; bug report 4.3BSD/usr.lib/153
sendmail security problems; bug report 4.3BSD/usr.lib/133
sendmail security problems; bug report 4.3BSD/usr.lib/136

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mail bounces on transient errors; bug report 4.3BSD/usr.lib/135

`LineNumber' not incremented when reading :include: file
bug report 4.3BSD/usr.lib/120

don't break old makefiles; bug report 4.3BSD/usr.lib/114

don't break old makefiles; bug report 4.3BSD/usr.lib/114

increase MAXFIELD to 4K; bug report 4.3BSD/usr.lib/153

forgot an extern int la; for load avarage.

fix shouldqueue to not get load average for evey file in queue
new queue locking code that uses flock()

new locking code that uses flock()

check if e_xfp is null before flushing it
move load average into a global so dont need to recalculate for every job

fix bug in delivering to files where can't read dfAA*
(open file before setuid)
new queue locking code based around flock()

dont recalculate load average for EVERY job in the queue

complain if cant use frozen config file

both the alias and alias ndbm files have to be protected

fix h_errno for ANSI C variable scoping

proper cast in printf (4.3BSD-tahoe/usr.lib/10)

add missing () to test in if statement to correctly accept -oM[rs]

eliminate floating point from the kernel (from forys@cs.utah.edu)

move newaliases to /usr/sbin

file reorg, pathnames.h, paths.h

add types.h for pwd.h

SMTP does not imply IPC; bug report 4.3BSD-tahoe/usr.lib/6

Berkeley specific copyright

#ifdef h_errno on NAMED_BIND