introduce a new fix map to move several fields by a lookup table

[vpeil]

in analogy the the lookup fix: this one lookups up in the table and moves the fields instead of changing the values.

[vpeil]

this one solves #67

[coveralls]

Coverage decreased (-0.01%) to 89.256% when pulling ef75f18 on pr/new-fix-map into 7c4c05d on dev.

[nichtich]

I'd like to rename this to mapping because map more likely refers to an individual row. We have fixes marc_map and pica_map, these could be extended with fixes marc_mapping and pica_mapping similar to this new fix. ok?

[nics]

mapping is indeed better, looks good otherwise

[vpeil]

mapping is indeed better, looks good otherwise

name of fix changed from map to mapping

[vpeil]

The tests fail for perl version 5.10 and 5.12, because one dependency module requires at least perl 5.14. Should we move on from these two versions?

[nichtich]

The failure was not caused by this PR but by #379

[nichtich]

I'd make deletion optional with option delete: 0 (default: 1) so you can also copy instead of rename.

[vpeil]

I'd make deletion optional with option delete: 0 (default: 1) so you can also copy instead of rename.

@nichtich delete option could be misinterpreted by users: it could mean "delete all fields not in the mapping table" (as we use it in the lookup fix). Maybe find another option name?

[nichtich]

How about `keep` to not delete anything?

[vpeil]

@nics @nichtich Anything else that prevents it from a merge?