allow locale's decimal point as radix character when parsing fixed-point decimal...

allow locale's decimal point as radix character when parsing fixed-point decimal into seconds and fractional seconds; handle case of shell script file descriptor being made non-blocking; fix smalkl memory leak in programmable completion of shell option names; fix for patsub_replacement behavior when BASH_COMPAT = 42 and the replacement string is quoted; fix for readine when changing show-mode-in-prompt variable