maint: use https for all Octave project URLs * README, update-bug-status.sh, configure.ac, bugs.txi, errors.txi, func.txi, octave-cli.1, octave.1, oop.txi, preface.txi, testfun.txi, CHECKLIST, PROJECTS, be_BY.ts, de_DE.ts, en_US.ts, es_ES.ts, eu_ES.ts, fr_FR.ts, it_IT.ts, ja_JP.ts, nl_NL.ts, pt_BR.ts, pt_PT.ts, ru_RU.ts, uk_UA.ts, zh_CN.ts, main-window.cc, welcome-wizard.cc, version.cc, __unimplemented__.m, help.m, __additional_help_message__.m, bug_report.m, info.m, __publish_html_output__.m, publish.m, get_forge_pkg.m, list_forge_packages.m, test.m, test_script_example.m: Use https for all Octave project URLs under octave.org or www.gnu.org/software/octave.

--- a/configure.ac	Tue Mar 27 12:38:00 2018 -0700
+++ b/configure.ac	Tue Mar 27 13:54:58 2018 -0700
@@ -20,7 +20,7 @@
 
 ### Initialize Autoconf
 AC_PREREQ([2.65])
-AC_INIT([GNU Octave], [4.3.0+], [http://octave.org/bugs.html], [octave])
+AC_INIT([GNU Octave], [4.3.0+], [https://octave.org/bugs.html], [octave])
 
 ### Declare version numbers