eml2eal() should import size, md5checksum, number rows, and download URLs

[kzollove]

This would enable best possible transfer from ezEML to EAL with minimal data loss.

My particular situation is that I'm trying to migrate metadata created in ezEML with 72 tables to EAL. If the above parameters were passed to make_eml(), there would be no need to ever physically download the data tables (that are currently in ezEML and have static download links)

Download example ezEML data package here

Is this too specific of a use case? Could play nicely with #107

[clnsmth]

Nice @kzollove. Yes, #107 should take care of this.

[kzollove]

A function eml2physical() will be added to eml2eal() that outputs a table physical.txt that is formatted like this.

Currently, the only hang up is handling the quote character field (") which causes the output table to collapse.

[kzollove]

@clnsmth so far I think the best representation is to always have an escaped quote character (i.e. \"). This outputs with no problem. Would that be workable on the make_eml() end?

[clnsmth]

Yeah @kzollove, quote characters are a bit challenging here, especially in and out of a spreadsheet editor. The current template_physical() plays nicely with make_eml() but is not optimal (see the docs for template_physical()). Maybe you can find a better solution?

Ultimately physical.txt should return unscathed from the round trip of template_physical() > make_eml() > eml2eal().