New burp engine, using variable length chunking (rabin fingerprinting),
inline deduplication and sparse indexing.

Very early work in progress - do not use if you value your data.
Merge branch 'master' into rabin
Preparation for new engine.
Merge branch 'master' into rabin

Conflicts:
	src/backup_phase4_server.c
	src/bedup.c
	src/server.c
	src/version.h
Remove split/strip_vss options.
Some sanitisation of send_file(), and removed more old bacula junk.
More send_file() cleanup.
Cleanup FT_DIRBEGIN/END.
More cleanup.
Merge branch 'master' into rabin
Test commit.
Merge branch 'rabin' of github.com:grke/burp into rabin
More find_files clean up.
More clean up.
Big shake up in how src/find.c works. Needs more fixing.
More find_files() fixes.
Yet more cleanup.
Rabin Makefile.
Started integrating rabin into main code.
Even more cleanup.