Added PSK support (thanks Mordy Ovits)
* Fix for CDR#2019022742006229 (Thanks T-Systems)
Fixed cut/paste error for SSL_ERROR_RECORD_OVERFLOW
* Fixed issue with pathlen=0 for root certs
Use <stdbool.h> for bools.
* Basic constraint/key usage v3 extensions now ...
* Basic constraint functionality added.
* X509 State, country and location are now used...