updated line-endings checker/fixer script, and fixed stray CRLF line endings in AI files.

git-svn-id: svn://svn.code.sf.net/p/freeorion/code/trunk@7212 dbd5520b-6a0a-0410-a553-f54834df5b05
AI cleanup patch by Cjkjvfnby -- 
  deleted unused file AIDemand.py

git-svn-id: svn://svn.code.sf.net/p/freeorion/code/trunk@7213 dbd5520b-6a0a-0410-a553-f54834df5b05