use containerized travis builds for extra speed
Make EUMM::open_for_writing, exportable, to open utf8-encoded
Fix RT 100268 - write the var that got encoded for that purpose
Fix distsignature dependencies for parallel make #177
[RT#101055] No status checking in "make ci"
Delete unused PM_TO_BLIB macro
Space-quote pm_to_blib args
Absolutise all typemaps because with deep-located typemaps, eg
"lib/XS/typemap", if xsubpp is called from top level with
    $(XSUBPP) ... -typemap "lib/XS/typemap" "lib/XS/Test.xs"
it says:
    Can't find lib/XS/type map in (fulldir)/lib/XS
because ExtUtils::ParseXS::process_file chdir's to .xs file's
location. This is the only way to get all specified typemaps used,
wherever located.
Sort realclean files = diff-able Makefiles
RE with interpolated filename needs quotemeta
Eliminate && from Makefile recipes - totally unnecessary
xs_obj_opt method adds -o to all $(CCCMD) commands to put .o next to .c
Minor tidyup in makeaperl