Fragile patch.

  This patch is ready to be aplied to Vanilla angband 2.9.5-alpha

  It adds a new item flag : TR3_FRAGILE
replacing the (I hope) unnused flag : TR3_XXX4

  Objects to get this flag should get marked with FRAGILE at
the appropiate files in the lib/edit folder
  But only weapons should get this flag.

  After every 100 hits made with a fragile weapon there is 5% chance
that the weapon will get destroyed. This includes artifacts that have
the FRAGILE flag.

TO DO:
  Wizard mode commands do not know about this flag.

Luthien
josedura@wanadoo.es