Main goal is to be able to run all programs "in place", i.e. in their
source directory without needing to install them. This is mandatory for
the server/tests infrastructure, which is not meant to be installed.

- introduce NETMAGIS_CONFIG, NETMAGIS_LIBDIR and NETMAGIS_VERSION
    environment variables in all server scripts
- get rid of the #!%TCLSH% pattern: replace it with #!/usr/bin/env tclsh
    which means that the "tclsh" wrapper must be installed (FreeBSD:
    dependancy required on the lang/tcl-wrapper port)