ncurses 6.0 - patch 20170204

+ trim newlines, tabs and escaped newlines from terminfo "paths" passed
  to db-iterator.
+ ignore zero-length files in db-iterator; these are useful for
  instance to suppress "$HOME/.terminfo" when not wanted.
+ amended "b64:" encoder to work with the terminfo reader.
+ modify terminfo reader to accept "b64:" format using RFC-3548 in
  as well as RFC-4648 url/filename-safe format.
+ modify terminfo reader to accept "hex:" format as generated by
  "infocmp -0qQ1" (cf: 20150905).
+ adjust authors comment to reflect drop below 1% for SV.