Release 1.4
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* When parsing MADX lattices, if an unknown element type is encountered,
the element will now be replaced by a Drift space (+ warning) rather than
being skipped
* Segments now have a method for inserting lattice elements
* Added an auxiliary function for comparing ORM and Twiss computations with MADX
* Rework the command line interface (now all functionality is available via subcommands)
* Allow to specify a label for 'create_script' function
* Add option for refer='center' when saving as MADX script
* Add function for computing Twiss values at the end of a beamline
* Add function for temporarily replacing element types with Drifts
* Allow makethin also for Drifts
* Add 'k1l' property to Quadrupole element
* Add option to make Segment[...] case insensitive
* Add new exception 'ElementNotFoundError' when querying a Segment with a string without wildcard ('*')
* When creating an HTML sequence, drift with aperture are now saved as 'Collimator'
* Add implementation of thick RF cavity (no MADX equivalent)
* Add option to load lattices via Python scripts / Add option for makethin in the CLI