Bug - Fix initial fen for flipello games (not enough pieces)

[JamesHeppell]

Due to passing in flipello (and flipersi) a player can actually play more than half the possible moves in total and therefore currently run out of 'drops'. I'm not sure what the upper bound is but something like 2/3 total spaces should be sufficient.
I would suggest changing the starting fen(s) to include more Pp's to accommodate this.
Suggest:

8x8 - (50)
startFen = 8/8/8/3pP3/3Pp3/8/8/8[PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPpppppppppppppppppppppppppppppppppppppppppppppppp] w 0 1

10x10 - (80)
startFen = 10/10/10/10/4pP4/4Pp4/10/10/10/10[PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPpppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp] w 0 1

6x6 - (24)
startFen = 6/6/2pP2/2Pp2/6/6[PPPPPPPPPPPPPPPPPPPPPPPPpppppppppppppppppppppppp] w 0 1