QGLoadInsertions["insertions.m"] loads insertion rules
from insertions.m for amplitudes generated with QGRAF.
Specifying only the file name means that
QGLoadInsertions will search for the file first in
$QGInsertionsDirectory and then in the current directory.
Specifying the full path will force the function to load the file from
there directly.
Evaluating QGLoadInsertions[] loads some common
insertions from QGCommonInsertions.m that are shipped with
this interface.
Overview, QGConvertToFC, QGCreateAmp.