* run clang-tidy with readability-braces-around-statements
clang-format the results
clean up all the parts that clang-tidy-8 broke
* fix problem on windows
* add queries for the number of heteroatom neighbors
* support cactvs "z" extension
this includes support for range queries on z that could
be extended to other query types as well
* extend range query extension to other SMARTS primitives
* add the less-than and greater-than versions of the range queries
* updates and new tests
* update .cmake files
* support [#6] in SMILES
* document SMILES extensions (such as they are)
* Add support for cactvs's Z queries
* add support for ^4 and ^5
* get tests running
doc update
* book updates
* update .cmake files
* atoms: radical electrons and presence of a chiral tag
* bonds: presence of stereo
* add new atom queries to python wrapper
* add queries for missing atom chiral tags