[Serusers] serctl: prefix for pid file; serctl restart semantics.

[JOHN J. BARTON]

By setting the environment variable LOCALBASE and the make variable 
"prefix", the install of ser can be *almost* completely in user disk
space. The exception I encountered is in serctl and sc scripts.  They 
have lines like
PID_FILE=/var/run/ser.pid
which is out of bounds for a /home user.

Perhaps this value could be read from the ser.cfg file.  Alternatively
an environment variable like SER_PID_FILE could introduced and PID_FILE
could pick it up if set.

Also "serctl restart" fails on an error if ser is not running.  The way
others servers, eg apache, work is for restart to mean
"if (alive) kill; start". That way the end point of "restart" is always
a running server with a newly read configuration or a server that failed
to start because of configuration failure.  It does not depend upon the
previous state. The combination "stop" followed by "start" already gives 
you a version of "restart" that fails on error if the server is not up.

By running ser directly both problems can be worked around.

John.