fix the 'Captain Future' bug: now names with \' signs no longer break the 'src' attribute of <image> tag
separate configuration handling in another file. now, if something is not defined for a folder, the data defined in the father folder config is used instead: it's possible by merging the folder' config with the father' one (view ConfigHandler.adapt and FolderConfig.merge_with methods), as it's done now.
modified according to the last modification. i'll write the configuration docs later