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all: Relicense VW as Apache 2
All our products from the Map makers is now Apache 2! Neeeaatt.
update copyright headers
fix VW_ECHO_N to match quoting semantics of AS_ECHO_N
old autoconf doesn't have AS_ECHO_N (but it does have _AS_ECHO_N)
Unfortunately, _AS_ECHO_N hard-coded duplication to an fd. Introduce a fixup
that uses _AS_ECHO_N's machinery but skips the fd
work around m4_include problems with ancient automake
make autoconf 2.65 work.