Test: Upgraded test framework

- Uses Taskwarrior's parallel harness.
- Uses Taskwarrior's 'problems' script for diagnosis.
- Removed 'run_all.in' processing.
- Removed Perl 'template.t' script.

test/template.t

@@ -1,40 +0,0 @@
-#! /usr/bin/env perl
-################################################################################
-##
-## Copyright 2006 - 2015, Paul Beckingham, Federico Hernandez.
-##
-## Permission is hereby granted, free of charge, to any person obtaining a copy
-## of this software and associated documentation files (the "Software"), to deal
-## in the Software without restriction, including without limitation the rights
-## to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-## copies of the Software, and to permit persons to whom the Software is
-## furnished to do so, subject to the following conditions:
-##
-## The above copyright notice and this permission notice shall be included
-## in all copies or substantial portions of the Software.
-##
-## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-## OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-## FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
-## THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-## LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-## OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-## SOFTWARE.
-##
-## http://www.opensource.org/licenses/mit-license.php
-##
-################################################################################
-
-use strict;
-use warnings;
-use Test::More tests => 2;
-
-use File::Basename;
-my $ut = basename ($0);
-
-# Bug <id> - <description>
-my $output = qx{../src/tasksh --version 2>&1};
-ok ($? == 0, "$ut: version check");
-like ($output, qr/^\d\.\d\.\d(?:\.beta\d)?$/ms, "$ut: tasksh version found");
-
-exit 0;