Log Message:
tex-memoir{,-doc}: update to 3.7r

 -- fixed typo in menual (table 7.2), \tocmark and similar does not
    take arguments, they have a static definition.
 -- fixed sporious space in \m at m@addamp
 -- made the font sizing macros robust (\normalsize, \small, ...)
    like with the standard classes (reported via private email)
 -- Addressed an issue where the combination of \DoubleSpacing
    and \paragraphfootnotes lead to an arithmetic overflow.
      Same fix has been applied to \paragraphfootstyle{...} where
    additionally a hardcoded 64 has been replaced by \footfudgefiddle.
 -- NB: Next memoir version will be labelled v3.7.19 (not v3.7s)