version 3.1.10

• fix gcc 11 build errors

version 3.1.9

• Remove Base::TOpt<T>. Instead use std::optional<T>.

version 3.1.8

• Replace -std=c++17 build option with -std=c++2a. This enables many but not all C++20 language features.
• Add Ubuntu 20.04 LTS build instructions.

version 3.1.7

• Update junit dependency for example Java client from 3.8.1 to 4.13.1

version 3.1.6

• server initialization code cleanup

version 3.1.5

• minor refactoring of config file processing code
• fix typo in example config file

version 3.1.4

• minor code cleanup

version 3.1.3

• fix gcc 10 build errors
• minor code cleanup

version 3.1.2

• Fix gcc 9 build errors

version 3.1.1

• Minor code cleanup