GAOL 4.2.0 available

The GAOL 4.2.0 release is now available. Barring minor modifications to correct bugs if need be, it is the last release for the Version 4 line.

Version 5 is scheduled to be a major rewrite of the GAOL library to ensure better portability and reliability.

Work on Version 4.2.0 was in part funded by the Indo-French Centre for the Promotion of Advanced Research in the context of IFCPAR/CEFIPRA Project #4502-1.