Change number of moved pages from the menu

[Guodong An]

I need to change the number of pages for ‘Next/Prev Num' command from time to time. But now it takes too many steps to find this parameter in setting and change it. Can you consider making an entry under ‘Jump’or ‘Page’menu to allow quickly setting of new numbers? Thanks you!

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[Ito Mitsuhiro]

メニューの項目を右クリックすることで直接コマンドパラメータ設定ウィンドウを呼び出せるようにした。 (fixed #719)

→ <<cset 7acfda6511da>>