- update Aclocal generated file due to change [r4100]
- update Autoconf generated file due to change [r4100]
- update 'AC_PREREQ' to reflect use of Autoconf 2.73
- update to Homebrew GNU Autoconf version 2.73
- update to reflect use of Homebrew distributions of GNU Autoconf version 2.73 and GNU M4 version 1.4.21 to generate portions of the Ox distribution
- apply changes [r4095],[r4096] to the Ox tag'd 1.12.3 release
- update change summary log
- update changes in the Ox 1.12.3 release