added non-inline operators to base Expression class so that non-sympy values (e.g. floats) can also be added/subtracted/etc... from anonymous expressions (named expressions non-sympy are already converted to their named 'symbol')
added non-inline operators to base Expression class so that non-sympy
values (e.g. floats) can also be added/subtracted/etc... from anonymous
expressions (named expressions non-sympy are already converted to their
named 'symbol')

INCF/lib9ML