Transition‐Metal Complexes with the Novel Poly (1,2,4‐triazolyl)borate Ligands [H n B(C 2 H 2 N 3 ) 4 − n ] − ( n = 1 and 2): Synthesis and Characterization of Metal Complexes of Dihydrobis(1,2,4‐triazolyl)borate as One‐ or Two‐Dimensional Coordination Polymers with Six‐Membered Ring Water Substructures and the Structure of Two‐Dimensional Liquid and Solid Water As Organized in the Intercalate [Ni{HB(C 2 H 2 N 3 ) 3 } 2 ] · 6 H 2 O (X‐ray Studies at 293 and 160 K)