Splines new

[ni-lon98]

Addition of spline representation for the coils.
The value of "version" in globals.f90 should be updated to the correct current value.

[zhucaoxiang]

@ni-lon98 Please let me know when you think I should begin my review and merge.

[zhucaoxiang]

@ni-lon98 I fixed two small bugs.

bug 1:

forrtl: severe (408): fort: (8): Attempt to fetch from allocatable variable STRAIGHT when it is not allocated

Image              PC                Routine            Line        Source
dfocus             0000000000B5B0BF  Unknown               Unknown  Unknown
dfocus             0000000000A4ECC3  saving_                  5855  saving_m.F90

I found coil%straight is only allocated when coil_type=1, so I also allocate it when coil_type = spline. Also, I remove the lines in saving.f90 which are used to temporarily save coil%straight.

bug2:

forrtl: severe (408): fort: (2): Subscript #2 of the array DERIV has value 10 which is greater than the upper bound of 9

Image              PC                Routine            Line        Source
dfocus             0000000000B5B0BF  Unknown               Unknown  Unknown
dfocus             0000000000A05704  saving_                    69  saving_m.F90

deriv array dimension should be revised since a new column was inserted.