MediterraneanNight*: gtk-3.0: Set gtkwindow color as @theme_fg_color.

This patch comes from a hint from "debianxfce11" at:

    http://gnome-look.org/content/show.php?content=156782&forumpage=14

Note that only two themes are patched, while we should actually patch all of
the themes.
MediterraneanNight: Add support for header bars.

Adapted from https://gist.github.com/Dvad/9210763/7df0e558 by Rogério Brito.

Signed-off-by: Rogério Theodoro de Brito <rbrito@ime.usp.br>
Include instructions for the panel.
gtk-2.0: terminal: Disable specific the notebook tab styling.

This is "less bad" than what we had, but still quite far from the ideal,
honestly.

Oh, and those pesky trailing whitespaces.  Still not certain if I will
remove them, unless I end up as the maintainer of this theme (which I would
not like to).
Fix whitespace and `^M` control characters normally generated by Windows

The original files contain `^M` control characters that usually originate
from editing files in Windows.  The dreaded dos line-endings. These control
characters can cause errors on Linux machines.

Extra whitespace at the end of lines is also removed.

[rbrito: Fixed commit message to have at most 80 characters.]

Signed-off-by: Rogério Brito <rbrito@ime.usp.br>
Make background transparent by default for all gtk3 widgets
Merge pull request #3 from Dvad/upstream-next

Correct tab and header bar colored square.