Fix vcfmerge format field handling for Number=G, INT8 PL, and dst buffer - #2520
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1. merge_localized_numberG_format_field: BCF_BT_INT32 case incorrectly used le_to_i16 instead of le_to_i32, causing wrong byte conversion for 32-bit integer FORMAT fields. 2. init_local_alleles: INT8 PL case lacked bounds checking on val before indexing into pl2prob[], risking out-of-bounds access. Added the same clamping guard (val>=0 && val<PL2PROB_MAX) already present in the INT16 and INT32 cases. 3. update_local_alleles: vector_end padding loop wrote to src[j] instead of dst[j], leaving the destination buffer with uninitialized trailing entries.
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Summary
le_to_i16tole_to_i32inBCF_BT_INT32case ofmerge_localized_numberG_format_field— was reading only 2 of 4 bytespl2prob[], matching existing INT16/INT32 checkssrc[j] = bcf_int32_vector_endtodst[j]inupdate_local_alleles— was writing to source buffer instead of destinationTest plan