New task insert position option; bugfixes

FIX: preg_replace, use of  /e deprecated in PHP 5.5
NEW: added new task insert position option: at top or bottom of
list/project (default=bottom)
VER: upped version number
CHG: sortable label is now an icon; more visible and clear
FIX: tab title now uses . instead of : between index and text (as per
help file)