Boulder Problems

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v91. Possibility to delete and modify comments. Ranking of climbers in a room.
v90. Possibility to sort boulders.
v89. Fixing saving to gallery in Android 11.
v88. Adding more ads to try to cover expenses of mantaining the server for the app.
v86. Fixes a problem that made some boulders not showing in the list. v85. Mantain boulder list position when going back.