cif_core.dic: `SymKey` and `SymLat` dREL functions assume single digit space group identifiers

[vaitkus]

Code snippets like:

Function SymKey( s :[Single, Symop])  {  # symop string
# <...>
    Else            n = AtoI(s[0])
# <...>

and

Function SymLat( s :[Single, Symop])  {  # symop string
# <...>
    Else              v = [ AtoI(s[2]), AtoI(s[3]), AtoI(s[4]) ]
# <...>

assumes that in a symop string (e.g. 1_555) the numeric space group id will only consists of a single digit (located in the first position of the string). This is incorrect, since many space groups contain more than 9 symmetry operations.