Drop .sp workaround, fix some typos in manpages and remove duplicated text

Manpage was including the text .5v at the end of some paragraphs. This
was caused by an old hack in the Makefile which removed the text .sp,
which was accidently added to the end of some paragraphs. (sed -i
's/\.sp//') Looks like this hack is not needed any longer, when
disabling it the .5v disappears as well (which might have been the text
".sp 5v")
Drop code related to scripts handling on DCSDIR, breaking it for GRMLCFG labeled devices

Removed again an if clause in the function which finds DCSDIR. It was
redundant as this case is handled before and it broke the use case of
running scripts on a GRMLCFG labeled device. Because it changed to
$DCSDIR instead of $DCSDIR/scripts.
Added some extra information about DCS directory on a live medium
Bump Standards-Version to 3.9.5
Run wrap-and-sort -a on debian directory
Release new version 0.13.0