New settings and outputs

All outputs are stored in data:
-error logs stored in data/logs
-downloads stored in data/files
-progress stored in data/prog

Progress is the record of web addresses that have been searched,
downloaded, or need to be searched, which are loaded at startup by
default if available.

Key words for stopping the program are now loaded from
settings/haltWords.txt
If the file isn't there, or otherwise fails to load, the default halt
word is 'x'