ncurses 6.1 - patch 20180303

ncurses 6.1 - patch 20180303

+ modify TurnOn/TurnOff macros in lib_vidattr.c and lib_vid_attr.c to
  avoid expansion of "CUR" in trace.
+ improve a few lintian warnings in test-packages.
+ modify lib_setup to avoid calling pthread_self() without first
  verifying that the address is valid, i.e., for weak symbols
  (report/patch by Werner Fink).
+ modify generated terminfo.5 to not use "expand" and related width
  on the last column of tables, making layout on wide terminals look
  better (adapted from patch by Kir Kolyshkin).
+ add a category to report_offsets, e.g., "w" for wide-character, "t"
  for threads to make the report more readable.  Reorganized the
  structures reported to make the categories more apparent.
+ simplify some ifdef's for extended-colors.
+ add NCURSES_GLOBALS and NCURSES_PRESCREEN to report_offsets, to show
  how similar the different tinfo configurations are.