beta 0.6.2.x update

Overlord: v.0.6.2.7 additional information
Research costs:
Т-54: 167.025
Panther II: 164.535
M26 Pershing: 174.690
"Object" 704: 152 900
"Object" 212 (SU-14 path): 185.570
"Object" 212 (S-51 path): 185.200
Gw-Panther: 116.580
Gw-Tiger: 166.000
M12: 112.250
M40/M43: 148.720
Price in credits:
Т-54: 2.940.000
Panther II: 2.850.000
Pershing: 2.980.000
"Object" 704: 3.547.000
"Object" 212: 2.490.000
Gw-Panther: 1.250.000
Gw-Tiger: 2.560.000
M12: 1.120.000
M40/M43: 2.438.000