Insight testsuite updated

[Martin M. Hunt]

There's been a lot of bitrot in the Insight testsuite the last 6
months.  This has been due to varobj enhancements, new tcl/tk, updated
widgets, and rewritten windows.  I should have kept the testsuite in
better shape.  It is fixed now. The varobj work even fixed all the
xfails in the variable tests.

Latest results Linux native:
Running ../../../src/gdb/testsuite/gdb.gdbtk/browser.exp ...
Running ../../../src/gdb/testsuite/gdb.gdbtk/c_variable.exp ...
Running ../../../src/gdb/testsuite/gdb.gdbtk/console.exp ...
Running ../../../src/gdb/testsuite/gdb.gdbtk/cpp_variable.exp ...
Running ../../../src/gdb/testsuite/gdb.gdbtk/srcwin.exp ...
FAIL: gdb.gdbtk/srcwin.exp: mixed mode disassembly of include file
(mi/1101) (srcwin-6.1)
Running ../../../src/gdb/testsuite/gdb.gdbtk/windows.exp ...

                === gdb Summary ===

# of expected passes            551
# of unexpected failures        1

- Martin