convert t/more.t to use Test::More
add warnings test to t/more.t
More.pm: remove usages of SUPER

Starting with perl 5.18, using Tk::More's Load() caused emitting
warnings in the form of

    Subroutine Tk::More::SUPER::insert redefined at ...

for every line inserted. The problem is probably caused by the Perl
commit aae438050a206a8067e068319ab3ee2348009463. But the SUPER
method calls are actually not needed here, so using normal method
calls for insert() and delete() fixes the problem.
increase version of Tk::More
update bundled WWWBrowser.pm to 2.51
tkpod: -geometry now works

tkpod is creating a hidden MainWindow, which is "eating" the -geometry
option. To fix this, a prescan of the cmdline arguments is done before
creating the MainWindow, remembered, and applied to Pod windows
created later.
test suite works with WMs with interactive geometry placement

I.e. running the test suite with ancient twm works now.
increase version of tkpod
prepare 0.9941_50
enable travis-ci