drop obsolete option --sxproxy (bb#503)
sxsetup: fix --force-reinit glitches (bb#543)
cosmetics
be quiet with --batch-mode (bb#548)
hdist: fix misuse of counter affecting calculations with variable point density
Fix checking if upload is finished (bb#545)
be consequent in requiring an existing directory

Before the fix sxcp -r sx://sth /tmp/dir/ would require /tmp/dir/ to be
created but sxcp -r sx://sth /tmp/dir would happily create the directory.

This commit makes the behaviour consistent, however the side effect is
that -r will not work nicely when copying single files.

The other solution is to go back to the old approach and create the
target dirs automatically.
pass proper sxf_handle to filter's configure
sqlite: print location of WAL_RETRY on SQLITE_PROTOCOL
Do not stop upload if 0-sized file is being transferred
Must call sqlite3_initialize before calling sqlite3_test_control

If sqlite3 is built with THREAD_SAFE=1 it must be called to prevent a null
deref.
drop valgrind.h: its not needed
Move SQLite3 to 3rdparty, and add flag to use system version
Introduce --with-system-libs flag (bb #457)
move sxserver/sxsetup to server/sxscripts/
make sxscripts work with --disable-sxhttpd too
move sx scripts to sbin
BSD sed doesn't have -i
don't use \0 in sed
parallelize .pushto