remove error datasets from schema

For the original implementation of Error datasets I added them
to the schema with an assoc table and a DAO to insert into that
table. As it turned out, the actual final implementation does
not use this, therefore remove the table from the schema and
all associated code.
add OfflineConfigs

add example OfflineConfig files for prod and replay
Merge pull request #4043 from hufnagel/offlineconfigs

add OfflineConfigs
Merge pull request #4041 from hufnagel/errordatasetschema

remove error datasets from schema
make express block closing delay configurable

WMAgent will close blocks a certain time after the block was created.
This timeout is hardcoded, but can be overridden in the Spec.
Express blocks need to be closed quicker, make the delay for them configurable.
make dropbox upload for express optional

Make specifying dropbox username and password optional.
If not specified and the express workflow contains
alcaharvesting, just finish there and do not attempt
an upload to the dropbox.
Merge pull request #4044 from hufnagel/expressclosing

make express block closing delay configurable
Merge pull request #4045 from hufnagel/dropboxoptional

make dropbox upload for express optional