Creates a new MetaInfoJob.
items - A list of KFileItems to get the metainfo for
w - Flags which serve as a preset which can be customized
with other parameters.
iocost - The allowed cost in terms of io to retrieve the
metainfo. The approximate maximum number of bytes to
be read is 10^iocost. Negative values mean that
there is no limit on the cost. 0 means that no fields
other than the required fields will be retrieved.
The default value of 3 means about 1024 bytes per
file may be read. This is merely a suggestion and not
a hard limit.
cpucost - The allowed cost in terms of cpu to determine the
information in the fields. The number mean the amount
of instructions allowed is 10^cpucost and is a suggestion only.
The default value of 6 means that about a million
instructions (10^6) are allowed. This is useful for
expensive fields like md5 or thumbnails.
requiredfields - The names of fields or groups of fields that should
be retrieved regardless of cost.
requestedfields - The names of fields or groups of fields that should
be retrieved first.
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