Support narrower (e.g. < 80 column) screen modes better
Maximize screen realestate for options/settings display:
- Don't place a margin around windows when in a narrow screen mode.
- Don't display shadows on windows when in a narrow screen mode.
This commit also fixes a bug in uinput() when left was non-zero and the total width (left + width) would be too wide for the screen. This bug was apparent in SCFG->Message Areas in 50 column mode (no Message Group window would be displayed when a message group was selected).
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