Swish is outdated and recoll works much better as a frontend to
xapian, so we adopt it to provide local search over file contents in a
tomb. This update also makes plocate optional to search over file
names, not mandatory. Recoll works also in GUI using its -c
commandline option followed by the indexed tomb's path.
tomb doesn't need lsof for anything else, and can work regulary without it.
So make it an optional feature, which allows to slam a tomb if lsof is installed
Updates additionally the man page and generates a new pdf from it
Apparantly fuser didn't report back, if the tomb was mounted in a subdir of /run (whereas /run itself is often a tmpfs mount).
With no list of process ids those couldn't be killed, so slamming the tomb failed.
lsof is capable to report back the sought information.
Fixes#220
Additionally fixing the debug output, where a hardcoded mountpoint was used
The fix is due to the new naming scheme without .tomb extension recently
introduced for mountpoints. While testing this a problem arised with
swish-e related to compression of indexes, to be addressed.
