support setting custom blob data location globally via config
added docu for supporting custom blob data location
support setting blobs data path per table
renamed global blobs path config setting
renamed per table blobs path setting
new snapshot version
added documentation about CRATE_HOME
implement information_schema.tables.blobs_path
docu: fix typo
added blob path CHANGES entry
improved COPY TO documentation: did not mention the whole export behaviour
when distributed storage systems are used.
Merge pull request #1022 from crate/l/improve-copy-to-docu

improved COPY TO documentation: did not mention the whole export beha…
fixed NPE at information_schema.tables `blobs_path`
create predicate documentation for existing predicates
actually execute the examples
refactored match function to predicate
added documentation for new match predicate
fixup! added documentation for new match predicate