Also fixes a typo

Set total data loaded for the PSD calculation from frame file to be `psd_duration`

See merge request Monash/tupak!75

Also adds documentation for buffer_time

- Removes overwrite_psd
- Make the data actually be set

- Add explicit sampling_frequency, duration, and start_time
- Generalise the 1s offset to an argument, buffer_time

In particular, merge bb9b5904 changes to set_data into their new
location.

add KAGRA

See merge request Monash/tupak!70

Add two extra seconds of data when reading from frame

See merge request Monash/tupak!73

Adds a set method from an array - this is used by set_data and
inject_signal.

Rather than passing around a list of interferometers, have a defined
set. Motivation: in several places we had dangerous calls to
interferometers[0].attribute which will get confusing if not all IFO's
have the same duration etc. This enforces that they do.

start_time -> epoch

Ensures that a useful error message is reported when the data is not set

Burst

See merge request Monash/tupak!71

- Add a InterferometerStrainData class
- Use set_data to set the strain_data attribute of interferometer
- Adds properties to interferometer which call down to the strain_data
- Rename data -> frequency_domain_strain (effects likelihood and utils)
- Removes whitened_data method that was not used
- Move data plotting to method of interferometer and remove duplicate
  code

Fix up logging

Closes #106

See merge request Monash/tupak!69

Add likelihood evaluations to the posterior data frame

Closes #105

See merge request Monash/tupak!68

- Checks if handlers already exist before adding them
- Add option to turn on/off printing of version information (off by
  default)
- Add call to setup_logger by default (with version information turned
  on by default)

Note - this makes empty calls to setup_logger() obsolete. However, if
you want to log to a file, with setup_logger(label='label') is still
useful.

- Only implemented for nestle and dynesty
- Other samples will have NaN

(partial) Fix #105

Docstring update

See merge request Monash/tupak!63

# Conflicts:
#	tupak/gw/conversion.py
#	tupak/gw/detector.py
#	tupak/gw/likelihood.py
#	tupak/gw/utils.py
#	tupak/gw/waveform_generator.py