MarkdownDB fixes

[olayway]

Changes

package.json

• added missing dependencies
• added mddb command that executes folder indexing (see /src/bin/index.js) - will probably be replaced with a full-blown CLI in the future

/lib

• introduced the distinction between simple object interfaces (e.g. File) from instances of database rows (e.g. MddbFile) represented by Mddb... classes that implement additional methods and in general should only be instantiated from records returned from the database
• added a simple validation function that checks if some of the objects in an array have the same value of a given property
  • added this check in batchInsert methods on Mddb... classes to catch duplicate values in JS and display objects that would cause SQL errors (which are impossible to debug 😅)
  • maybe we could add some validation package in the future, but for now this should do

+ Bunch of other fixes caught after testing with datahub-next

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