change format of version history resource names

fixes signedness of salt in dav_pw2key()

fixes format string containing the NUL character instead of printing the NUL character in get_random_name()

fixes signedness issue in get_random_name()

fixes signed vs unsigned inaccuracy for the -T option

adds command alias 'cat' for 'get -o -'

more sstr to scstr conversion

fixed TODO: use strtol

fixes todo: use scstr instead of sstr

nicer dav usage info

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