Improving import and export support

[techAPJ (Arpit Jalan)]

Here is the howto for migration:

Migrate from another forum to Discourse

This guide serves as a high level overview of the migration process. For specifics on the wide range of forum softwares to import, including Vanilla, phpBB3, SMF2, bbPress, and vBulletin, review our dedicated tutorials. Not all scripts have tutorials, but an exhaustive list of available imports is available under the script/import_scripts folder on GitHub. For larger migrations, there is also a faster script/bulk_import system that writes directly to the database. So you want to mi…