The STORAGE_AUTOEXCLUDE_LEVEL now defines the first level as the
directory below the top-level directory, e.g. "/*". Earlier the
top-level directory itself, e.g. "/" was defined as the first level,
causing some confusion. The default is two levels from root-dir,
i.e. directories matching "/*" or "/*/*" will be checked for
automounted directories with file_space config file empty and
STORAGE_AUTOEXCLUDE_LEVEL undefined.

5.0, 5.0.1: shapshot directories are now removed by default. Handling
of full disk on the collector host is improved.

Accounting of files sometimes needs use of df and ls. This should now
work also when there are spaces in file/path name.