torch/torch7-distro — pull request #170 by jucor (2013-10-12 12:47:30+00:00)
Title: Add support for QT term in gnuplot

This patch inserts 'qt' as terminal type for gnuplot for all OSes, with lower
precedence than 'wxt' but higher than 'x11'

Qt is a better alternative than x11, according to
[gnuplot 4.6.0 release notes](http://www.gnuplot.info/announce.4.6.0):

```
NOTES TO PACKAGERS AND TESTERS
===============================

Configuration options for interactive use
-----------------------------------------

The 4.6 source code supports three primary cross-platform output modes in
addition to several platform-specific modes.

1) Cairo/pango/wxWidgets
These terminals were introduced in version 4.4 and are now the most
stable and full-featured option. This set of terminals includes
- pngcairo, pdfcairo, epscairo, and cairolatex for output to a file
- wxt for interactive display
This is the default configuration, but requires prior installation of
libcairo, libpango, libcairo, libwxgtk, and related support libraries
To disable these terminals:
./configure --disable-wxt --without-cairo

2) Qt
The new qt terminal supports interactive display with menu-driven
output to png, svg or pdf.
Requires libqt version >= 4.5
./configure --enable-qt

3) X11 (the "classic" interactive interface)
This used to be the preferred interactive interface, but the newer
wxt and qt terminals offer nicer output and a wider range of features.
```