Added fallbacks to flux.sh in case realpath is not available.
Added fallbacks to flux.sh in case realpath is not available.

The bash script now uses $BASH_SOURCE to find out its name. If
`realpath` is not available `readlink` is tried. If this is not
available the script attempts to extract link targets from ls
output. Link resolution is now only attempted if $BASH_SOURCE
contains a soft link.

metafacture/metafacture-core,guenterh/linked.swissbib.mf,hbz/metafacture-core,guenterh/nlRunnerAdvanced,cboehme/metafacture-core,guenterh/mfRunnerPlayBox,metafacture/metafacture-core,hbz/metafacture-core,guenterh/mfRunnerPlayBox,guenterh/nlRunnerAdvanced,guenterh/linked.swissbib.mf,culturegraph/metafacture-core,culturegraph/metafacture-core,guenterh/nlRunnerAdvanced,culturegraph/metafacture-runner,hbz/metafacture-core,metafacture/metafacture-core,cboehme/metafacture-core,culturegraph/metafacture-runner,guenterh/linked.swissbib.mf,cboehme/metafacture-core,culturegraph/metafacture-core,culturegraph/metafacture-runner,cboehme/metafacture-core,guenterh/mfRunnerPlayBox