gitk: make configuration dialog resizing useful

gitk's configuration dialog can be resized, but this does not expand the
space allocated to any widgets. Some items may have long lines of text
that would be visible if the widgets expanded, but this does not happen.

The top-level container uses a two column grid and allocates any space
change equally to both columns.  However, the configuration pages are
contained in one cell so half the additional space is wasted if
expanding. Also, the individual configuration pages do not mark any
column or widgets to expand, so any additional space given is just used
as padding.

Collapse the top-level page to have one column, placing the "OK" and
"Cancel" buttons in a non-resizing frame in column 1 (this keeps the
buttons in constant geometry as the dialog is expanded). This makes all
additional space go to the configuration page.

Mark column 3 of the individual pages to get all additional space, and
mark the text widgets in that column so they will expand to use the
space. While we're at it, eliminate or simplify use of frames to contain
column 2 content, and harmonize the indents of that content.

prefspage_general adds a special "spacer" label in row 2, column 1, that
causes all of the subsequent rows with no column 1 content to indent,
and this carries over to the next notebook tab (prefspage_color) through
some undocumented feature. The fonts page has a different indent, again
for unknown reason. The documented approach would be to use -padx
explicitly on all the rows to set the indents.

Signed-off-by: Mark Levedahl <mlevedahl@gmail.com>

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