Update coding style

Remove -nut because is not specified as being part of the source code
style. Add -nprsa, -saf, -sai and -saw because they are mentioned in
the Indent manual as being part of the source code style. The GNU
Coding Standards don't mention it in the list of options but I tested
Indent and verified it does this.

Signed-off-by: Jason Self <j@jxself.org>