Revert "Increase the abyss rune chance on levels A:4 and A:5"

As pointed out in #8906, this commit actually decreased the rune chance
on all levels.

This reverts commit b33f7a63b51833bf6587609a29efdcc2c40cfa2e.
Remove a reference to jewellery identification in a hint.
Correct some hints: stairs can be taken with a click, no need to shift.
Hints: remove a warning about monsters picking up items.
Use $cmd lookup for a command in a hint
0.15 tournament reminder

see cf47855, etc.
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