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
fix: COPY TO docu did not mention the whole export behaviour when distributed storage systems are used.
fixup! fix: COPY TO docu did not mention the whole export behaviour when distributed storage systems are used.