new suspension_thermal() function for calculating thermal noise of a
single suspended optic.

ifo SuspensionThermal Noise class modified to handle specific case of
Fabry-Perot Michelson.

substrate_thermoelastic() function updated to calculate thermal noise
of a single suspended optic.

ifo SubstrateThermoElastic Noise class modified to handle specific
case of Fabry-Perot Michelson.

substrate_brownian() function updated to calculate thermal noise of a
single suspended optic.

ifo SubstrateBrownian Noise class modified to handle specific case of
Fabry-Perot Michelson.

substrate_thermorefractive() function updated to calculate thermal
noise of a single suspended optic.

ifo ITMThermoRefractive Noise class modified to handle specific case
of Fabry-Perot Michelson.

substrate_carrierdensity() function updated to calculate thermal noise
of a single suspended optic.

ifo ITMCarrierDensity Noise class modified to handle specific case of
Fabry-Perot Michelson.

new coating_brownian() and coating_thermooptic() functions for
calculating coating thermal noise spectrum for a single optic.

ifo CoatingBrownian and CoatingThermoOptic Noise classes modified to
handle specific case of Fabry-Perot Michelson.

This refactors the seismic noise calculation to be for a single suspension.
The turning of that into a seismic noise spectrum for a LIGO-like IFO is
moved to the Seismic(nb.Noise) class definition in the ifo module,
effectively separating fundamental seismic noise calculation from assumptions
of experimental configuration.

susQuad function take sus Struct instead of full ifo

all test will pass again after this commit

For some reason these noises were just dividing by L**2 to convert to
strain, rather than using the dhdl conversion.

This changes the noises for Voyager and CE2, so the tests fail, and
the IFO caches should be updated when this is merged.

Drop specific comparison to MATGWINC output and move to comparisons to
cached hdf5 traces.  Comparisons to all cached IFO traces will be done by
default.  A PDF report of all discrepancies for all IFOs will be
generated if requested.  inspiral ranges will be calculated if the
inspiral_range package is available.

This adds trace caches (in git-lfs) for all currently supported IFOs,
effectively snap-shotting the current state of the repo.

gitlab CI also updated to use new tests

Should cover/simplify the most common use case, equivalent to running:

load()
update(**kwargs)
calc_traces

Needs to be implemented.

eliminate need for separate sub-module

This replaces load_ifo(), and returns only the Budget class.

Any ifo.yaml found in a budget package is loaded as ifo attribute.  other
stuff can just be assumed to be provided as class attributes as well.

move load_struct logic into Struct.from_file() class method, and remove
load_struct function.

Improves update() method to be able to update from another Struct, and
not overwrite existing Struct attributes, and removes need to
from_dict classmethod.

and use in load_struct

as per expected from dict method.

swap out deprecated interface

This allows for direct comparison between py and mat gwinc.

This fixes a regression in the move to the new Budget structured. The keys
in the gwinc() noises output changed to be the name of the Noise class,
instead of the label, causing the matgwinc comparison test to fail.

This fixes the keys in the gwinc noises output to be the labels to maintain
consistency.

Fix suspension: silicon blade spring

2 um wavelength

Seismic and Newtonian parameters