adm/git-version.txt should be in .gitignore
Remove adm/gdp-version.txt in favor of adm/gdp-get-version.sh (more
flexible printing of various parts of the version number).
Create gdp-version.txt while creating gdp-version.sh for use in simple
places like Makefiles.
Administrative script cleanup.
Auto-create a new script adm/gdp-version-edit.sh that will convert
templates with version indicators into files with version numbers. That
script is created at the same time as the gdp_version.h file.