tree checksum vpatch file

all signers: asciilifeform bvt diana_coman

antecedents: ffa_ch2_logicals.kv ffa_ch1_genesis.kv ffa_ch4_ffacalc.kv

press order:

ffa_ch1_genesis.kvasciilifeform bvt diana_coman
ffa_ch2_logicals.kvasciilifeform bvt diana_coman
ffa_ch3_shifts.kvasciilifeform bvt diana_coman
ffa_ch4_ffacalc.kvasciilifeform bvt diana_coman
ffa_ch5_egypt.kvasciilifeform bvt diana_coman

hunks:
ffa/ffacalc/ffa_calc.adb
ffa/libffa/fz_arith.adb
ffa/libffa/fz_arith.ads
ffa/libffa/fz_basic.adb
ffa/libffa/fz_basic.ads
ffa/libffa/fz_divis.adb
ffa/libffa/fz_divis.ads
ffa/libffa/fz_lim.adb
ffa/libffa/fz_mul.adb
ffa/libffa/fz_mul.ads
ffa/libffa/fz_type.ads
ffa/libffa/w_pred.adb
ffa/libffa/w_pred.ads