fix bug #36228: reserved identifier violation variables and macro names beginning with _ are renamed to XB_. More consistent naming of include guards. See link in bug report.
Updated copyright notice to 2012
added/fixed i18n support via gettext to xboard this was already added a long time ago, but now it's added again to autoconf. Also fixed some compile errors that showed up.
Updated copyright notice to 2011
updated year in copyright info
clean-up some file permissions where set up wrong (e.g. execute permissions for text files)
cleaned up some more copyright notices
Updated all files to GPL version 3.
Additions required by xboard i18n