Accept negative inputs to -2^63 for dec2bin and dec2hex (bug #63089) dec2bin.m: Accept negative inputs lower than -flintmax down to -2^63 Return 64-bit string in certain cases for Matlab compatibility Activate BISTs commented out earlier dec2hex.m: Remove repeated code and call dec2bin instead Accept negative inputs lower than -flintmax down to -2^63 Update and activate BISTs commented out earlier

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