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##

Optimization of Basis Sets (SCF only)

For this task you have to specify:
$optimize
basis on
internal off

This example would perform only a basis set optimization without
accompanying geometry optimization. It is possible, of course, to
optimize both simultaneously: Just leave out the last line of the
example (`internal off`

). Input data groups are:
`$egrad`
- Basis set exponents, contraction
coefficients, scaling factors and their respective gradients as
provided and accumulated in subsequent optimization cycles by one of
the programs
`grad` or `mpgrad`, if `$drvopt basis on` has
been set.
`$basis`
- Description of basis sets used, see Section 4.2.

Output will be the updated basis on `$basis`, and the updated
force constant matrix on `$forceapprox`.
For an example, see Section 16.5.

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