Cannot have two lines (two blocks with a vertical flow) in the header, the footer or a column

[pvalsecc]

I guess we need a lines block:

        - !lines
?         backgroundColor: #FFFFFF
?         spacingAfter: 0
          items:
            - {BLOCK_DEFINITION}
            {...}

[pvalsecc]

Change of direction to use the KISS method...

I didn't add a new block type but made few small changes:

1. Added a new optional parameter to the !columns block: nbColumns. If specified, the items are arranged into the specified number of columns and lines are added.
2. By default, the header and footer are arranged by lines
3. For the user's sanity, added a !table block type that is an alias to the !columns block type.

Since the changes overlap with the ticket #151 changes, I uploaded a new patch (V2) in this ticket that includes those modifications. Please review.

[pvalsecc]

Committed (r882)

[bilok]

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