Retire UCI_AnalyseMode option

It has been obsoleted out already some time ago
and currently there is no point in changing eval
score according to if we are in game or analyzing.

So retire the option.

No functional change.
Simplify Bitboards::pretty

No functional change.
Merge pull request #2 from mcostalba/master

merge from mcostbalda:master
Merge branch 'master' into tweak-probcut-precondition