* revert duplicate chunk in release notes
* replace deprecated ifdefs
This one gets rid of USE_BUILTIN_POPCNT and RDK_THREADSAFE_SS
use RDK_OPTIMIZE_POPCNT or RDK_BUILD_THREADSAFE_SSS instead
* get rid of BUILD_COORDGEN_SUPPORT from ROMol.i
* fix a stupid typo
* update release notes