Fixed ambiguous truth value bug in _fitting_GP returns, bumped to 1.6.14.

added sphinx.configuration key to ReadTheDocs config

updated ReadTheDocs config to fix broken builds

Merge pull request #16 from volodia99/cross-section

corrected names of variable 'I' and method 'shift_center' in cross_section

Fixed resampling for integrated spectra.

bumped version number

added some more comments

forced all zdisk values to be finite in _get_shadowed_coords

bumped setup version

made sure to only include non-NaN pixels when using integrated_spectrum

bumped setup version

avoided flipping data when saving shifted cube

avoided flipping data when saving shifted cube

added pyproject.toml