Updated version tag

Make a better description tag

Bump release number for addition of u8_[un]setenv

Bumped release number for accumulate macro changes, etc

Welcome 2.7

Updated to 2.6.9

Bumped version number for UNWIND_PROTECT fixes

Added u8run executable

This version introduces moment and thread variables on u8_exceptions

Bumped release number to 5 to note inclusion of the new u8_big_alloc …

…calls