Fixes several issues in Advanced Solar Panels.

Fixed errors:

• Crashing with newer IC2 builds (2.8.191+)
  • java.lang.NoSuchMethodError: ic2.core.block.invslot.InvSlotProcessable.<init>(Lic2/core/block/TileEntityInventory;Ljava/lang/String;ILic2/api/recipe/IMachineRecipeManager;)V
  • java.lang.NoSuchMethodError: ic2.core.block.invslot.InvSlotOutput.<init>(Lic2/core/block/TileEntityInventory;Ljava/lang/String;I)V
  • java.lang.NoSuchMethodError: ic2.core.block.invslot.InvSlot.<init>(Lic2/core/block/TileEntityInventory;Ljava/lang/String;Lic2/core/block/invslot/InvSlot$Access;ILic2/core/block/invslot/InvSlot$InvSide;)V
• Double Stone Slab duplicating adjacent blocks