These are common enough clauses in Irish wills
Very briefly,
S 55
The inclusion of this clause allows a personal representative to appropriate any part of the estate (except specific bequests) to satisfy general bequests, without notice or consent from perhaps warring beneficiaries.
S 63
The purpose of this clause is to counteract s 63 and to have any advancements made during the testator’s lifetime disregarded in determining the child’s inheritance under the will.
In other words, if a testator wanted to leave €100,000 to a child, this clause ensures as far as possible that the child receives €100,000 and not €100,000 less the value of any gifts received during the testator’s lifetime.