Reorganize files to help include them as libraries for other projects

--HG--
rename : src/bb_gh_sync.py => bb_gh_sync.py
rename : src/check_execs.py => check_execs.py
rename : src/dir_size_monitor.py => dir_size_monitor.py
rename : src/djvu2pdf.py => djvu2pdf.py
rename : src/dpkg_diff.py => dpkg_diff.py
rename : src/flatten_nested_lists.py => flatten_nested_lists.py
rename : src/ftp_server_test.py => ftp_server_test.py
rename : src/ftp_upload.py => ftp_upload.py
rename : src/get_size.py => get_size.py
rename : src/logger.py => logger.py
rename : src/move_by_ext.py => move_by_ext.py
rename : src/notify.py => notify.py
rename : src/pacman_diff.py => pacman_diff.py
rename : src/rsync_backup.py => rsync_backup.py
rename : src/rsync_fabfile.py => rsync_fabfile.py
rename : src/send_email.py => send_email.py
rename : src/shuffle.py => shuffle.py
rename : src/smtp_server_test.py => smtp_server_test.py
rename : src/template.py => template.py
rename : src/test_dir_tree.py => test_dir_tree.py
rename : src/web_lxml.py => web_lxml.py