bin.junk/alldb.pl - repurpose as meta table fixup for satellite DBs

&show_tables_dulike : redundant to team_tools.git bin/mysql-size2du
bin/showpath - include PERL_LOCAL_LIB_ROOT
sanity-checking bodge to tell where compiled perl libs will go

under ExtUtils::MakeMaker and Module::Build
 with PREFIX or INSTALL_BASE
bin/tmpls - include /dev/shm
mysqldump4archive - (fetch; compress&)

run compression in parallel with subsequent dump;
chmod is postponed, and tolerant of omitting the mk-table-checksum part