gnu: Rename "octave" to "octave-cli".

* gnu/packages/maths.scm (octave): Rename to...
(octave-cli): ...this.
[name]: Change to "octave-cli".
(qtoctave): Inherit from octave-cli.
(flann)[inputs]: Adjust accordingly.
* gnu/packages/engineering.scm (qucs)[inputs]: Likewise.
(qucs-s)[inputs]: Likewise.
* gnu/packages/machine-learning.scm (shogun)[inputs]: Likewise.