JSDAI v4.3.0 release

Another significant improvement of JSDAI is now available with the v4.3.0 release. The new release is still fully upward compatible with the original 1.0 release more than 10 years ago. This demonstrates the stability and efficiency of the overall structure. Main new improvements since 4.2 are memory optimized SdaiModel without inverse pointers, especially for huge geometrical data sets, and an enhanced database backup and restore mechanism that can now include all user management information and the complete change history (who changed what and when).