wrappers: blueprint has static folder check

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>
cache: use CFG_DATABASE_NAME as CACHE_PREFIX if not specified
Merge remote-tracking branch 'adrianp-github/cswwd-wrappers' into code-structure-with-webdeposit
Merge branch 'code-structure-with-webdeposit' of https://github.com/jirikuncar/invenio into cswwd