ugrep v4.3.2

• new official ugrep.com web site with the ugrep user guide and installation instructions, this site will always be safe and guaranteed to be ad free and cookie free; ugrep.org forwards to ugrep.com
• double short option -%% enables both --files --bool (a single -% still enables only --bool) for convenience
• updated thread pool scheduling and execution with thread affinity and priority settings, implements #305
• improvements and fixes for minor (mostly cosmetic) issues
• updated ugrep v4.3.2 benchmarks.

Please consider updating your links to point to ugrep.com instead of the ugrep GitHub project web site, when applicable. The web site is hosted with GitHub pages. If you have any concerns or questions about the link and web site, then please ask!