Long overdue update to the update_server script to match production

 * Added code for handling 1.8 and 1.10
 * Don't use libana for Wesnoth versions that include it (1.9.x)
 * We now use Git, not SVN. The downstream repository is managed
   externally, so we need to update a git-new-workdir checkout every
   time we want to build.
 * Other nondescript changes

(Apologies for the horrible commit message, but it looks like there was
more than my own changes awaiting to be committed.)
Update send_server_command with code changes from production

They mostly seem to be code cleanups or style changes, plus the hack to
try to start the irc echo for the old instance after restarting... which
doesn't seem to be working.
Update tail_log_irc script from production

Removed a "fix the script" message.
Update create_symlinks script from production
Updated logfilter_irc* scripts with the current production versions
Update new_release script from production
Update run_server script from production
Update run_campaignd script from production
Remove empty directory tree containing nothing but .gitignore files