With --thread a signle thread ID or thread URL can be entered.
If thread is a URL, it will download it.
If thread is an ID, a category must also be set.
Configuration Settings can now be changed with the -e command line argument
execution of 4grab has been moved to 4grab.py, but should also still work with download.py
Windows was giving trouble with the os.getenv(HOME) which can be executed in the python shell and IDLE and will return C:\Documents and Settings\username\, but when running a script it will return None.
If os.getenv(HOME) is None, then now the exec dir will be used instead
* Seperated the parser from the downloader code.
* Added a progressbar class, to make it look fancier
* Created some functions to do all the work in downloader.py, cleaner now
* Changed parser.py to htmlparser.py, since it was conflicting with a built-in module
