Fix a warning produced by gcc 4.6.3.

Specifically, "warning: function declaration isn’t a prototype"
Gitignore archive (.a) files.
Implement amulet of change title.

Only blessed amulets allow you to change your title. Uncursed and
cursed amulets do nothing. Once you have a custom title the only
way to change it is to get another blessed amulet of change title.
Fix buffer overflow.
Merge branch 'change_title' of github.com:wxsBSD/bingehack4 into change_title

Conflicts:
	libnethack/src/do_wear.c