Fix for the pipe_control.exp_info.bmrb_write_software() function.
This was broken back at r26071 (http://article.gmane.org/gmane.science.nmr.relax.scm/23822). The
variable name change of software.name to software.software_name was not applied to the
pipe_control.exp_info module. This caused a few of the Bmrb system tests to fail.
