* update version of japanese docs
* Remove external labels from cores
* Fix syntax errors
* Add better autodetection of labels, add dummyatom label, don't fall back to indexes when onlyMatchAtRgroups are set
* Add better autodetection of labels, add dummyatom label, don't fall back to indexes when onlyMatchAtRgroups are set
* Move autodetection before alignment, fix final core labelling
* Fix stupid bit twiddling mistake
* None of the original mol's should actually match the cores with onlyMatchAtRgroups
* Convert PRECONDITION to CHECK_INVARIANT
* Run clang-format
* use nullptr instead of 0 for pointers
* Handle cases where molecules don't have anything for an R-group properly.
Here's the python demo of the bug:
```
In [14]: scaffold2 = Chem.MolFromSmiles('c1c([*:1])cncn1')
In [15]: scaffold = Chem.MolFromSmiles('c1c([*:1])cccn1')
In [19]: mols2 = [Chem.MolFromSmiles(smi) for smi in 'c1c(F)cc(O)cn1 c1c(F)cncn1 c1c(Cl)cc(O)cn1'.split()]
In [20]: print(rdRGroupDecomposition.RGroupDecompose([scaffold,scaffold2],mols2,asSmiles=True,asRows=False))
({'Core': ['c1ncc([*:2])cc1[*:1]', 'c1ncc([*:1])cn1', 'c1ncc([*:2])cc1[*:1]'], 'R1': ['F[*:1]', 'F[*:1]', 'Cl[*:1]'], 'R2': ['[H]O[*:2]', '[H]O[*:2]', '']}, [])
```
* Fixes#2471
* add documents translated into Japanese
* add conf.py
* change links to images
* change Translation_into Japanese to Translation_into_Japanese
* move japanese translation to Book_jp
* update image paths
* makefile and config
* remove Book/Translation_into_Japanese
