Use "default" instead of "black" in mutt coloring

Mutt should use the terminal's background color rather than black.
Make the status bar a little bit narrower
Revert back to the 80 limit for more compability with other devices
Remove colorgcc as it is slow
Add English spell check as well to the mailmode
Enable long line highlight by default
Match my inputrc in commandline editing
Save last position when traversing indentations
Make sure to process every buffer

The previous version stops processing buffers if it encounters a wiped out
buffer.