Fix incompatibility with ZFA's "head". #3360
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In ZFA, the "head" (ZFA:0001114) corresponds to what Uberon calls the "craniocervical region" (UBERON:0007811), comprising the head proper and the neck. So we remap ZFA:0001114 to UBERON:0007811, rather than UBERON:0000033).
Also, the axiom stating that 'pharyngeal arch' (UBERON:0002539) is part of the 'embryonic head' (UBERON:0008816) is bogus, as some pharyngeal arches are located in the neck rather than the head. So we create a new term 'embryonic craniocervical region' to be the embryonic counterpart of 'craniocervical region' (as 'embryonic head' is the embryonic counterpart of 'head'), and rewrite the aforementioned axiom to state that 'pharyngeal arch' is part of the 'embryonic craniocervical region'.
Combined together, these two changes fix about 80 unsatisfiable classes in the merge product of Uberon and ZFA.
closes #379