added an example of a portal with a synthesis boundary

Change-Id: Ic6557c277dc022ec650e3f4051ef5e0cde811f85
portal.md has been replaced by portal.asciidoc

Change-Id: I72dbf03e6c0c01adf00e6bbe65895b1654b11f07
fixed .ac701run target

Change-Id: Iecd8b817b164f7aeef3779e57b0c3ce11e4684cb