Sanity text in the theme editor when you have a child theme

[nacin]

When editing a child theme, there's no way to know whether you're editing a parent theme file or a child theme file. This could be disastrous, as you could later lose your changes on an update of Twenty Ten when you thought you were doing everything right.

A little warning just above the Save Changes button should be enough as a sanity check until we can more thoroughly overhaul the theme editor in potentially 3.2.

See also #15671, which was a prerequisite to this ticket.

[nacin]

(In [16712]) Sanity text in the theme editor when you have a child theme. fixes #15672.

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(In [16714]) Don't even show parent theme files when viewing the child theme. see #15672.

[nacin]

After talking with Jane some more, I've made a few more minor improvements.

Following up with one last color change.

[nacin]

(In [16716]) Don't use orange as an on state. Also, restore zero margin on the filename header. fixes #15672.

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(In [16717]) Add 'Visual Editor RTL Stylesheet' to the list of theme file descriptions. see #15672.

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(In [16718]) Always land on style.css by default, rather than whichever stylesheet came first in the directory scan. Prevents useless trips to editor-style-rtl.css and the like. see #15672.

[nacin]

Ok, done :-)

[nacin]

[16715] missed the ticket.