<ticket>#351</ticket> <bugfix>core.system.executable_in_path now checks the correct error code from core.system.execute_cmdline()</bugfix>
<ticket>#351</ticket>
<bugfix>core.system.executable_in_path now checks the correct error code from core.system.execute_cmdline()</bugfix>

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core.system.executable_in_path now checks the correct error code from core.system.execute_cmdline().
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core/system/unix.py:

	executable_is_in_path: checks the correct error code, which has changed since the move from popen to subprocess.

minesense/VisTrails,minesense/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,minesense/VisTrails,hjanime/VisTrails,Nikea/VisTrails,celiafish/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,hjanime/VisTrails,hjanime/VisTrails,Nikea/VisTrails,celiafish/VisTrails,celiafish/VisTrails,minesense/VisTrails,celiafish/VisTrails,VisTrails/VisTrails,minesense/VisTrails,hjanime/VisTrails