1. in preference add column 'download path' for watched folders
2. change logic checkbox in column 'download here': if it 
checked, then torrent file will download to watchdir, if state is 
unchecked, will be use download path from next column.
x fix first page in options.ui
x fix default path for multipath watch folders
- clean from debug files
Merge remote-tracking branch 'p166/master'

Conflicts:
	src/scannedfoldersmodel.cpp
	src/webui/prefjson.cpp