Fix user interface for right-to-left. Backport.

Tavmjong Bahrequested to merge
Tavmjong/inkscape:text-r2l-alignment-1.4.x into 1.4.x

For right-to-left text:

  1. changing text-alignment (via text-toolbar) now keeps text in the same place;
  2. align left, align right text-toolbar buttons now works correctly;
  3. text-alignment indicator now placed correctly on canvas.

Also:

  • Code simplification.
  • Restore setting alignment to last used for new text. (Only works first time for new text, this is a separate bug.)

Fixes #594 (closed), maybe fixes #1151.

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