New feature - menu item formatting

[ncursesml]

Hello,

Im new on this ML, so sorry for any mistakes...

Long story short:
I was wandering if menu items can be formatted autonomously, but sadly there is 
no set_item* API for this purpose. So I went and made terrible hack in 
/ncurses/base/MKunctrl.awk to allow passing ANSI control sequences in menu 
strings. That actually was partially successful, but unstable and not portable.

Another try goes directly to menu library, it works for my purposes, so I would 
like to present you with the result (and possibly get merged?)

Quick description:

1) new field in menu.h:
  tagITEM - unsigned int attr; /* Item attributes */

2) New functions introduced:
  set_item_attr() /* Set attribute as attron() does */
  item_attr() /* Return current attributes of the item */

3) Patched _nc_Post_Item() to actually format the item

Diff files are attached.
Any comments welcomed.

Best regards,
Martin Sacha

menu.h.diff
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m_item_opt.c.diff
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m_post.c.diff
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