remove README_alpha file since it is no longer needed
use gnu automake option instead of gnits option
added en quoting variants to translation list
removed unneeded blank line from translation list
removed tools/ subdirectory from distribution

Since it is not possible to rebuild the ChangeLog file without being
in a git working directory of flex, distributing the tools directory is misleading. In particular, git2cl will always fail.
name english quoting variants correctly
git ignore generated files from english quoting variant translations
list new location of flex git repo
bump AM_GNU_GETTEXT_VERSION to 0.18.1
remove unmaintained xml documentation
list more generated files in CLEANFILES
remove some unneeded entries from the todo list
update nl translation from the translation project
update vi translation from the translation project
mention updated nl, vi translations in release news
rename zh_tw translation to its proper zh_TW name
update zh_CN translation from the translation project
mention updated zh_CN in release news
update tr translation from the translation project
mention updated tr translation in news