Overwrite w3m M-n keybinding to scroll up one line

Signed-off-by: Chirantan Ekbote <chirantan.ekbote@gmail.com>
Use absolute paths in xinitrc, add command for xscreensaver

Signed-off-by: Chirantan Ekbote <chirantan.ekbote@gmail.com>
Update w3m keybinding, fix inconsistent indentation, switch isearch functions

Remap M-n to scroll-up-one-line in w3m mode.  This was previously
bound to w3m-copy-buffer, which is duplicated by C-c C-t.  Fix
inconsistent mixing of tabs and spaces.  All indentation is now done
using spaces.  Swap isearch-{forward,backward} keybindings with the
keybindings for isearch-{forward,backward}-regexp.

Signed-off-by: Chirantan Ekbote <chirantan.ekbote@gmail.com>