Cannot compile with JDK 1.8
The commit:f714b8119 introduced a change in the gnss-attitude branch
on April 21 and merged back into develop branch on May 21 generates
a compilation error with Java 1.8 compilers (Oracle JDK 1.8 and
OpenJDK 1.8). The error is on line 669 of file BatchLSEstimator.java.
There are no compilation errors wih Java 9 compiler used in 1.8
compatibiliy. The code seems to be correct, but older compilers
fail to understand a parameterized class.
(from redmine: issue id 462, created on 2018-05-22, closed on 2018-06-04)