Fix wrong order of parameters in call to append_str_2_file

[bedroge]

This PR fixes an issue in execute_programs.pm, which has a call to append_str_2_file with the parameters in the wrong order:

append_str_2_file($info_string,$configHash->{'versions_file'});

It should be:

append_str_2_file($configHash->{'versions_file'},$info_string);