Patch for cfengine-1.5.4 (setting uid, gid in shellcommands)

[Weil, Stefan 3732 SFA-5]

Hello to all cfengine users,

this patch fixes some bugs I noticed with shellcommands which
use user= and group= parameters and a minor documentation bug.

1. The URL given for cfengine in README.install did not exist.
   This is an error which still exists in cfengine-1.6.0.

2. The error message for failures of setegid in src/cfengine.c
   wrongly displayed the uid, not the gid. This is an error
   which still exists in cfengine-1.6.0 (popen.c).

3. The error message for failures of setegid in src/cfengine.c
   displayed a failure of seteuid, not setegid. This is fixed
   in cfengine-1.6.0.

4. At least for Solaris 8, the order of seteuid and setegid had
   to be reversed. It must be first setegid, then seteuid, otherwise
   setegid might fail for uid != root. This seems to be fixed
   in cfengine-1.6.0.

Kind regards,
Stefan Weil

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cfengine-1.5.4.patch
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