Bump version to 1.0.7 for release

Make C++ standard more explicit (#44)

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replaced C-style arrays with std::vector (#26)

* replaced C-style arrays with std::vector

* fixed copy constructor

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Patch 3 update (#23)

* Added a BUILD_BYPRODUCT to ImportPugiXML.cmake for compatibility with Ninja

* Make functions of ECPIntegral const and thus calculation of ECP integrals thread-safe

* Spacing

* Add const to derivative functions

* Fixed issue in RadialInt Type1 where the wrong start can be found depending on l

* Fixed some missing consts in ecp header, and adjusted accuracies of hess_test1 and 2

* Updates to docs and readme for patch 3 of version 1

Co-authored-by: Thomas Dresselhaus <[email protected]>
Co-authored-by: Robert Shaw <[email protected]>

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Finalises patch 1 for v1.0

Final update of release 1.0.0