#120 Add a rewrap marker for centered paragraph with rewrap.

[Richard Tonsing]

Currently there is the /F...F/ markup for indicating centered paragraphs without rewrapping such as:

/F
Paragraph without rewrap
Unrewrapped paragraph continued.
F/

Which should result in

Paragraph without rewrap
unrewrapped paragraph continued.

Please add a rewrap marker which would allow centering with rewrapping such as the following:

/G
Paragraph with rewrap
rewrapped paragraph continued.
G/

To result in

Paragraph with rewrap rewrapped paragraph continued.