Updating source texts according to fixes on en_US catalog

Text wrapping consumes large amount of memory.

WWSympa: send_mail: Restrict MIME content type of uploaded HTML text (#716)

Recent version of Test::Pod required by Log::Any required by Code::TidyAll is not bundled in Perl 5.18 or earlier.

Separate installation of MHonArc::UTF8

WWSympa: edit_list: Use 'Apply modifications' instead of 'Update' to make sure the changes/deletions will be effective only if update is performed.

WWSympa: editsubscriber/review/set: Use 'Apply modifications' instead of 'Update' to make sure the changes/deletion will be effective only if update is performed.

WWSympa: edit: Use 'Apply modifications' instead of 'Update' to make sure the changes/deletion will be effective only if update is performed.

Sympa::Tools::Text::wrap_text() consumes large amount of memory for large size of texts.  Reduce it.

Allow to activate pending lists with sympa.pl

Update Text::LineFold (#709)

- Small change to --open_list to let it handle pending lists
- Add --show_pending_lists=robot option to print pending lists (with some
  informations)

Fix #637

Fix crash of RC4 encrypted password notice.

More fix to #516

stats page generates spurious warnings in stderr (#700)

web_tt2/info.tt2 generates some noise in stderr

Drop support for Perl 5.8.x (#620)

task_manager.pl dies when the list no longer exist (#681)

[bug] task_manager.pl dies when the list no longer exist when some command such as sync_include was executed.
Fixed by checking if target list exists.

Fix tidying of src/lib/Sympa/List.pm

Additional fix to #516

mtime of file like .last_change.admin was not updated