Schema Issue, RFC 7991, New Section 2.54.2

[levkowetz]

New Section 2.54.2

The version 3 schema deprecates the previously available 'align'
attribute for the tables, and the V2 to V3 converter will remove this
attributes if used. This makes a previous feature that was appreciated
by some authors unavailable. In the text formatter, the effect is
simply to make all tables left-aligned, which may not be the most
readable and polished output, but for the HTML formatter it also
potentially removes the option of letting text flow around smaller
tables in a controlled way.

Recommendation: Make the 'align' attribute for tables available again.

Implementation: Implemented but inactive in the current version of
xml2rfc. The current text formatter code already has
support for the 'align' attribute for these elements;
but since the schema does not permit the attribute for
<table>, the code is never invoked.

[reschke]

+1, but duplicated #9