openssl: Report correct key length for EC keys when not using NIST curves

Fixes #688.
Allow to treat specified Attribute-Type-Not-Supported errors as non-fatal
Implemented IF-M segmentation contracts
Added request variable to get_info_string method
Implemented IF-M segmentation
Added out message queue for imv_msg receive method
Merged libpts into libimcv
Compacted chunk creation in ita_attr_command constructor
Unit tests for libimcv
Register the reception of the AIK attribute
Assignment of flags starts with bit 0