[pkg] Depend on Pillow instead of PIL
The Pillow library is becoming the de-facto replacement for PIL.
It also is way simpler to install with pip than PIL.
Closes #4411354.
import ConfigParser
try:
undo_actions = config.cfgfile_parser.get('MAIN', 'undo-support', False)
except ConfigParser.NoOptionError:
pass # this conf. file was probably already migrated
else:
config.global_set_option('undo-enabled', bool(undo_actions))