Changes in build process

I will shortly introduce two changes in the build environment:

1) killer: If a build has taken longer than 20000 seconds, all
   processes involved in the build will be summarily executed.
   Depending on where in the process the build is, this may result in
   strange result reports for this build. Currently, the only notice
   will be a mail to snake-farm-reports.

2) no more make file: the top script in the build process has until
   now been a make file. Since make stops executing commands if it
   gets a non-zero exit code, this means that a killed build would not
   return a meaningful result. In order to get anything out of a build
   that has been killed by the killer, the top script will now be a
   shell script.

These are difficult changes to test, so there may be some weirdness
before all bugs are weeded out.
-- 
Anders "Quest" Qvist

There's a shadow on the faces of the men who fan the flames
Of the wars that are fought in places where we can't even say the names
  -- Jackson Browne, Lives In the Balance