Miscellaneous macros used by others of the author's packages.
Contents of the package: \newgif and other globals; \@ifnextcat
and \@ifXeTeX; \(Re)storeMacro(s) to override redefinitions;
\afterfi and friends; commands from relsize, etc.; "almost an
environment" or redefinition of \begin (\begin* doesn't check
if the argument environment is defined).
