GDA Util: Removed global variables

Pavlo Solntsevrequested to merge
pavlosun/libgda:wip/glob_var into master
  • Global variables removed
  • G_N_ELEMENTS macro use to determine array size
  • Parameter checks added/modified
  • Documenting nullable reurn value

gda-utils.c

Edited by Daniel Espinosa Ortiz

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